Research Topics
| Purnendu K DasguptaSummaryAffiliation: University of Texas at Arlington Country: USA Publications
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Publications
Black box linearization for greater linear dynamic range: the effect of power transforms on the representation of dataPurnendu K Dasgupta
Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas 76019 0065, United States
Anal Chem 82:10143-50. 2010..Power responses are intrinsic to some detection schemes, and in others they are imbedded in instrument firmware to increase apparent linear range that the casual user may not be aware of. The consequences are demonstrated and discussed...- Perchlorate in the United States. Analysis of relative source contributions to the food chainPurnendu K Dasgupta
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409 1061, USA
Environ Sci Technol 40:6608-14. 2006..Fireworks presently constitute a potentially important source of increasing importance but a quantitative impact cannotyet be assessed... - Intake of iodine and perchlorate and excretion in human milkPurnendu K Dasgupta
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019 0065, USA
Environ Sci Technol 42:8115-21. 2008.... - Iodine nutrition: iodine content of iodized salt in the United StatesPurnendu K Dasgupta
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019 0065, USA
Environ Sci Technol 42:1315-23. 2008..There is much recent literature on iodine sufficiency and uptake inhibitors; there is also much misinformation and disinformation. We review the relevant literature and discuss our results with reference to the United States... 
Chromatographic peak resolution using Microsoft Excel Solver. The merit of time shifting input arraysPurnendu K Dasgupta
Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019 0065, USA
J Chromatogr A 1213:50-5. 2008..I show here that such deconvolution can be considerably improved if one or more of the response arrays are iteratively shifted in time...- Green analyzer for the measurement of total arsenic in drinking water: electrochemical reduction of arsenate to arsine and gas phase chemiluminescence with ozoneMrinal K Sengupta
Department of Chemistry and Biochemistry, University of Texas at Arlington, Planetarium Place, Arlington, Texas 76019 0065, USA
Anal Chem 82:3467-73. 2010..Comparison of total As results in native and spiked water samples with those from inductively coupled plasma mass spectrometry (ICPMS) and other techniques show high correlation (r(2) = 0.9999) and near unity slopes... 
Rapid point of care analyzer for the measurement of cyanide in bloodJian Ma
Department of Chemistry and Biochemistry, University of Texas, 700 Planetarium Place, Arlington, Texas 76019 0065, USA
Anal Chem 83:4319-24. 2011..The results showed good correlation (slope 1.05, r(2) 0.9257); independent calibration standards were used...- Cobinamide chemistries for photometric cyanide determination. A merging zone liquid core waveguide cyanide analyzer using cyanoaquacobinamideJian Ma
Department of Chemistry and Biochemistry, University of Texas, 700 Planetarium Place, Arlington, TX 76019 0065, USA
Anal Chim Acta 736:78-84. 2012..The setup is readily used to measure thiocyanate with different reagents. We demonstrate applicability to real samples by analyzing human saliva samples and hydrolyzed extracts of apple seeds, peach pits, and almonds... - Recent developments in cyanide detection: a reviewJian Ma
Department of Chemistry and Biochemistry, University of Texas, 700 Planetarium Place, Arlington, TX 76019 0065, United States
Anal Chim Acta 673:117-25. 2010.... - A simple inexpensive gas phase chemiluminescence analyzer for measuring trace levels of arsenic in drinking waterMrinal K Sengupta
Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019 0065, USA
Environ Pollut 158:252-7. 2010..A single instrument weighs less than 3 kg, consumes <25 W in power, can be incorporated in a briefcase and constructed for <$US $1000. It is easily usable in the field... - Breastfed infants metabolize perchlorateC Phillip Shelor
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019 0065, USA
Environ Sci Technol 46:5151-9. 2012..20 and 1.58; the difference was not significant (p = 0.68). However, the small number of subjects in the latter group makes it more difficult to conclude definitively whether perchlorate reduction does or does not occur... - Creatinine adjustment of spot urine samples and 24 h excretion of iodine, selenium, perchlorate, and thiocyanateShin ichi Ohira
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019 0065, USA
Environ Sci Technol 42:9419-23. 2008..5 to +101% from the actual measured value, the minimum absolute error being 2.5%. Creatinine adjustment for estimation of 24 h excretion from spot samples was not effective for iodine, selenium, perchlorate, or thiocyanate... - Perchlorate and iodide in dairy and breast milkAndrea B Kirk
The Institute of Environmental and Human Health, Texas Tech University, Lubbock, Texas 79409 1163, USA
Environ Sci Technol 39:2011-7. 2005..On the basis of limited available data, iodide levels in breast milk may be significantly lower than it was two decades ago. Recommended iodine intake by pregnant and lactating women may need to be revised upward... - Review of analytical methods for the quantification of iodine in complex matricesC Phillip Shelor
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019 0065, USA
Anal Chim Acta 702:16-36. 2011..However, a general review of iodine determination on a wide-ranging set of complex matrices is not available. While this review is not comprehensive, we cover the principal developments since the original development of the S-K method... - Temporal patterns in perchlorate, thiocyanate, and iodide excretion in human milkAndrea B Kirk
Department of Chemistry, University of Texas at Arlington, Arlington, TX 76009 0065, USA
Environ Health Perspect 115:182-6. 2007..Perchlorate is a common contaminant of water, food, and human milk. Although it is known that iodide undergoes significant diurnal variations in serum and urinary excretion, less is known about diurnal variations of milk iodide levels... - Can breath isoprene be measured by ozone chemiluminescence?Shin ichi Ohira
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409 1061, USA
Anal Chem 79:2641-9. 2007..Even though present at lower concentrations than isoprene, unless removed prior to CL measurement, for some individuals sulfur gases can cause unacceptably large (up to 500%) errors, making the sulfur gas removal step critical... - Perchlorate in dairy milk. Comparison of Japan versus the United StatesJason V Dyke
Departments of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409 1061, USA
Environ Sci Technol 41:88-92. 2007..4 +/-2.7 microg/L, n = 54), which are higher on average than those found in U.S. dairy milk samples reported by a 2004 Food and Drug Administration (FDA) study (5.9+/-1.8 microg/L, n= 104)... - Measurement of nitrophenols in rain and air by two-dimensional liquid chromatography-chemically active liquid core waveguide spectrometryLucksagoon Ganranoo
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019 0065, USA
Anal Chem 82:5838-43. 2010..Illustrative air and rain data are presented... - Measurement of soil/dust arsenic by gas phase chemiluminescenceMaather F Sawalha
Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019 0065, USA
Talanta 77:372-9. 2008..6, 1.3, 6.7, and 6.4 microg/L for As(III), As(V), dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA), respectively... - The origin of naturally occurring perchlorate: the role of atmospheric processesPurnendu K Dasgupta
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409 1061, USA
Environ Sci Technol 39:1569-75. 2005..We report that perchlorate is present in many rain and snow samples. This strongly suggests that some perchlorate is formed in the atmosphere and a natural perchlorate background of atmospheric origin should exist... - Rapid nondestructive spectrometric measurement of temperature-dependent gas-liquid solubility equilibriaJian Ma
Department of Chemistry and Biochemistry, University of Texas, Arlington, Texas 76019 0065, USA
Anal Chem 83:1157-61. 2011..Very little sample is required for the measurement; the K(H) for 4-hydroxynonenal, a marker for oxidative stress, is measured to be 56.9 ± 2.6 M/atm (n = 3) at 37.4 °C with 1 mg of the material available... - Airborne bacterial spore counts by terbium-enhanced luminescence detection: pitfalls and real valuesQingyang Li
Department of Chemistry and Biochemistry and Nano Tech Center, Texas Tech University, Lubbock, Texas 79409 1061, USA
Environ Sci Technol 42:2799-804. 2008..We show that aromatic acids are very likely large interferents. This interference typically constitutes approximately 70% of the signal and can be as high as 95%. It can be completely removed by prewashing the particles... - Electrodialytic membrane suppressors for ion chromatography make programmable buffer generatorsYongjing Chen
Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas 76019 0065, USA
Anal Chem 84:67-75. 2012..We believe that this approach will be of value for the generation of eluents in the separation of proteins and other biomolecules and in online process titrations... - Fenton digestion of milk for iodinalysisC Phillip Shelor
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019 0065, United States
Anal Chem 83:8300-7. 2011..Following digestion, iodine was found to exist entirely as iodide. Control of pH is imperative if loss cannot be corrected for by isotope dilution. Loss was below 20% for all samples when the pH was between 2.25 and 2.5... - Perchlorate production by ozone oxidation of chloride in aqueous and dry systemsNamgoo Kang
Department of Civil and Environmental Engineering, Texas Tech University, Lubbock, Texas 79409 1023, USA
Sci Total Environ 405:301-9. 2008..It also suggests that ClO(2)(-) may be a key intermediate while ClO(3)(-) and OCl(-) are unlikely to play a significant role... - On-line electrodialytic salt removal in electrospray ionization mass spectrometry of proteinsYongjing Chen
Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas 76019 0065, USA
Anal Chem 83:1015-21. 2011..Good-quality ESI-MS spectra of cytochrome c, myoglobin, and lysozyme as test proteins in a saline solution, passed through the SR, are demonstrated... - Cobinamide-based cyanide analysis by multiwavelength spectrometry in a liquid core waveguideJian Ma
Department of Chemistry and Biochemistry, University of Texas, 700 Planetarium Place, Arlington, Texas 76019 0065, USA
Anal Chem 82:6244-50. 2010..We demonstrate applicability by analyzing the hydrolytic cyanide extract of apple and pear seeds with orange seeds as control and also measure HCN in breath air samples. Spike recoveries in these sample extracts ranged from 91 to 108%... - Hybrid fluorometric flow analyzer for ammoniaNatchanon Amornthammarong
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
Anal Chem 78:1890-6. 2006..Precision for liquid-phase injections is even better (n = 1520, [NH4+(aq)] = 2.5 microM, RSD = 2%). The response decreases by 3.6% from 20 to 80% relative humidity... - Trace iodine quantitation in biological samples by mass spectrometric methods: the optimum internal standardJason V Dyke
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409 1061, USA
Talanta 79:235-42. 2009..Use of (129)I as an internal standard resulted in excellent recovery of iodine from both milk and urine samples using either IC-MS/MS and ICP-MS... - Characterization of a constant current charge detectorMasanobu Mori
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019 0065, USA
Talanta 102:44-52. 2012..Analyte peak widths and peak asymmetries were found to be governed by the mobility of the analyte ions and their affinities for the IEMs, respectively... - Versatile gas/particle ion chromatographS M Rahmat Ullah
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
Environ Sci Technol 40:962-8. 2006.... - Measurement of ammonia in human breath with a liquid-film conductivity sensorKei Toda
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
Anal Chem 78:7284-91. 2006..For breath CO2 measurement, the applicability of a similar sensor that relies on a NaOH film was also demonstrated... - Automated measurement of urinary creatinine by multichannel kinetic spectrophotometryShin ichi Ohira
Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, TX 76019 0065, USA
Anal Biochem 384:238-44. 2009..9906). The developed system allows rapid, simple, cost-effective, and robust creatinine analysis and is suitable for the analysis of large numbers of urine samples... - Free solution hydrodynamic separation of DNA fragments from 75 to 106,000 base pairs in a single runXiayan Wang
Department of Chemistry and Biochemistry, The University of Oklahoma, Norman, Oklahoma 73019, USA
J Am Chem Soc 132:40-1. 2010..We also demonstrate that attractive separation is possible in a few minutes and that the separated DNA can be collected into individual fractions that remain viable for amplification via the polymerase chain reaction... - Charge detector for the measurement of ionic solutesBingcheng Yang
Department of Chemistry and Biochemistry, University of Texas, 700 Planetarium Place, Arlington, Texas 76019 0065
Anal Chem 82:951-8. 2010.... - Use of a capacitance measurement device for surrogate noncontact conductance measurementMasaki Takeuchi
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019 0065, United States
Talanta 76:617-20. 2008..The detection limits deteriorate as the conduit inner diameter decreases... - Robust hybrid flow analyzer for formaldehydeIn Yong Eom
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79400 1061, USA
Environ Sci Technol 42:1221-6. 2008..Features of the data, including an episode in which the HCHO concentration exceeded 50 ppbv, the highest reported ambient HCHO concentration in North America to our knowledge, are discussed in some detail... - pH- and concentration-programmable electrodialytic buffer generatorYongjing Chen
Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas 76019 0065, USA
Anal Chem 84:59-66. 2012..We also demonstrate an additive-subtractive mode of operation where both inward and outward currents are used to add one type of ion while removing another type of ion to reproducibly generate pH/concentration gradients... - Flow batteries for microfluidic networks: configuring an electroosmotic pump for nonterminal positionsChiyang He
Department of Chemistry and Biochemistry, The University of Oklahoma, Norman, Oklahoma 73019, United States
Anal Chem 83:2430-3. 2011..In a fluidic system powered by flow batteries, a hydraulic equivalent of Ohm's law can be applied to analyze system pressures and flow rates... - Summertime ambient formaldehyde in five U.S. metropolitan areas: Nashville, Atlanta, Houston, Philadelphia, and TampaPurnendu K Dasgupta
Department of Chemistry, Texas Tech University, Lubbock, Texas 79409 1061, USA
Environ Sci Technol 39:4767-83. 2005..The data set presented here can be used as a benchmark for future measurements if the use of formaldehyde precursors such as methanol or methyl tert-butyl ether (MTBE) as oxygenated fuel additives increases in the future... - Sensing parts per million levels of gaseous NO2 by a optical fiber transducer based on calix[4]arenesShin ichi Ohira
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019 0065, USA
Talanta 77:1814-20. 2009..The nitrosonium calixarene derivative tends to transform to the nitrated form; this process is catalyzed by light. Several methylated calixarenes were synthesized and tested but a fully satisfactory solution has proven elusive... - A time-gated fluorescence detector using a tuning fork chopperQingyang Li
Department of Chemistry and Biochemistry, Texas Tech University, 700 Planetarium Place, Lubbock, TX 79409 1061, USA
Anal Chim Acta 616:63-8. 2008.... - Gas collection efficiency of annular denuders: a spreadsheet-based calculatorJordan M Berg
Department of Mechanical Engineering, Texas Tech University, Lubbock, TX 79409 1021, United States
Anal Chim Acta 664:56-61. 2010..The present spreadsheet calculator can be used easily and simply without training and will be a useful tool for denuder users and designers... - A continuous analyzer for soluble anionic constituents and ammonium in atmospheric particulate matterRida Al-Horr
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
Environ Sci Technol 37:5711-20. 2003..With a 15 min analytical cycle and a sampling rate of 5 L/min, the limit of detection (LOD) for ammonium is 8 ng/m3 and those for sulfate, nitrate, and oxalate are < or = 0.1 ng/m3. The system has been extensively field tested... - Oxidation state-differentiated measurement of aqueous inorganic arsenic by continuous flow electrochemical arsine generation coupled to gas-phase chemiluminescence detectionMrinal K Sengupta
Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium Place, Arlington, Texas 76019 0065, United States
Anal Chem 83:9378-83. 2011..The basic electrochemical arsine generation technique and current-differentiated oxidation state speciation should be applicable as the front end to many other arsenic measurements techniques, including atomic spectrometry... - Determination of trace perchlorate in high-salinity water samples by ion chromatography with on-line preconcentration and preelutionKang Tian
The Institute of Environmental and Human Health and Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409-1061, USA
Anal Chem 75:701-6. 2003..The ability of this approach to remove matrix interferences suggests that it would be also promising for perchlorate analysis in other challenging samples... - Doped soap membranes selectively permeate a chiral isomerTinakorn Kanyanee
Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
J Am Chem Soc 132:18045-7. 2010..6:1) of α(+)-pinene over α(-)-pinene... - Nanocapillaries for open tubular chromatographic separations of proteins in femtoliter to picoliter samplesXiayan Wang
Department of Chemistry and Biochemistry, The University of Oklahoma, Norman, Oklahoma 73019, USA
Anal Chem 81:7428-35. 2009..We achieve baseline resolution for a protein mixture consisting of transferrin, alpha-lactalbumin, insulin, and alpha-2-macroglobulin... - A cold plasma dielectric barrier discharge atomic emission detector for atmospheric mercuryMahitti Puanngam
Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, TX 76019 0065, USA
Talanta 81:1109-15. 2010..8 to 4.9%. In 19 separate calibrations conducted over 7 days, the calibration slope had a standard error of 1%. The system was applied to the determination of atmospheric mercury in two different locations... - Temperature dependence of Henry's law constant for hydrogen cyanide. Generation of trace standard gaseous hydrogen cyanideJian Ma
Department of Chemistry and Biochemistry, University of Texas, 700 Planetarium Place, Arlington, Texas 76019 0065, USA
Environ Sci Technol 44:3028-34. 2010..86 and 3.22 at 25.0 and 37.8 degrees C, respectively. The technique also allows for convenient generation of trace levels of HCN at ppbv-ppmv levels that can be further diluted... - Durable microfabricated high-speed humidity sensorsPetr Kuban
Department of Chemistry and Biochemistry, and NanoTech Center, Texas Tech University, Lubbock, Texas 79409, USA
Anal Chem 76:2561-7. 2004..We demonstrate applications as a breath monitor. Such sensors should also be of utility in atmospheric eddy measurements. Short-term repeatability is better than 0.6% RSD (n = 7)... - Fiber optic sensor for simultaneous determination of atmospheric nitrogen dioxide, ozone, and relative humidityShin ichi Ohira
Department of Chemistry and Biochemistry, The University of Texas at Arlington, 700 Planetarium Place, Arlington, Texas 76019 0065
Anal Chem 81:4183-91. 2009..Overall, this provides a viable affordable approach for inexpensive measurement of atmospheric NO(2) and O(3)... - Oxygen-independent poly(dimethylsiloxane)-based carbon-paste glucose biosensorsJoseph Wang
Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA
Biosens Bioelectron 17:999-1003. 2002..On-line continuous testing indicates favorable dynamic properties with no carry-over effects over the physiological and pathophysiological range (3-12 mM glucose)... - Microscale continuous ion exchangerPetr Kuban
Department of Chemistry and Biochemistry, Texas Tech University, Lubbock 79409-1061, USA
Anal Chem 74:5667-75. 2002..Theoretical models and computations are presented along with experimental results. The potential of such a system as a chip-scale post-separation suppressor/reactor is evident... - Perchlorate in milkAndrea B Kirk
The Institute of Environmental and Human Health, MS 1163, USA
Environ Sci Technol 37:4979-81. 2003..5 microg/L. The levels found ranged from 1.7 to 6.4 microg/L. An evaporated milk sample contained perchlorate at 1.1 +/- 0.6 microg/L level, while we did not find detectable levels in a reconstituted powdered milk sample... - Field instrument for simultaneous large dynamic range measurement of atmospheric hydrogen sulfide, methanethiol, and sulfur dioxideKei Toda
Department of Environmental Science, Faculty of Science, Kumamoto University, 2 39 1 Kurokami, Kumamoto 860 8555, Japan
Environ Sci Technol 38:1529-36. 2004..Walkaround portability of the instrument and very large dynamic range measurement of H2S and SO2 were demonstrated around the Mt. Aso volcano...