Measurement of Soil/Dust Arsenic by Gas-Phase Chemiluminescence

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dc.contributor.authorMaather F. Sawalha
dc.contributor.authorMrinal K. Sengupta
dc.contributor.authorShin-Ichi Ohira
dc.contributor.authorAdemola D. Idowu
dc.contributor.authorThomas E. Gill
dc.contributor.authorLila Rojo
dc.contributor.authorMelanie Barnes
dc.contributor.authorPurnendu K. Dasgupta
dc.date.accessioned2017-05-03T09:36:37Z
dc.date.available2017-05-03T09:36:37Z
dc.date.issued2011-05-04
dc.description.abstract<p>A gas phase chemiluminescence (GPCL) based method for trace measurement of arsenic has been recentlydescribed for the measurement of arsenic in water. The principle is based on the reduction of inorganic As to AsH3at a controlled pH (the choice of pH governs whether only As(III) or all inorganic As is converted) and the reactionof AsH3 with O3 to produce chemiluminescence (Anal. Chem. 78 (2006) 7088-7097). The same general principlehas also been used in postcolumn reaction detection of As where As species are separated chromatographically,then converted into inorganic As by passing through a UV photochemical reactor followed by AsH3 generation andCL reaction with ozone (Anal. Chem. 79 (2007) 9197-9204). In the present paper we describe the measurement ofAs in different soil and dust samples by serial extraction with water, citric acid, sulfuric acid and nitric acid. Wealso compare parallel measurements for total As by induction coupled plasma mass spectrometry (ICP-MS).As(V) was the only species found in our samples. The ICP-MS results were highly correlated with direct GPCLand LC-GPCL results (r2 = 0.xxxx and 0.xxxx, respectively). The limit of detection (LOD) in the extracts was0.36 g/L by direct GPCL compared to 0.1 g/L by ICP-MS. In sulfuric acid based extracts, the LC-GPCLmethod provided LODs inferior to those previously observed for water based standards and were 2.6, 1.3, 6.7 ,and6.4 μg/L for As(III), As(V), dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA) respectively.</p>en
dc.description.abstract<p>A gas phase chemiluminescence (GPCL) based method for trace measurement of arsenic has been recentlydescribed for the measurement of arsenic in water. The principle is based on the reduction of inorganic As to AsH3at a controlled pH (the choice of pH governs whether only As(III) or all inorganic As is converted) and the reactionof AsH3 with O3 to produce chemiluminescence (Anal. Chem. 78 (2006) 7088-7097). The same general principlehas also been used in postcolumn reaction detection of As where As species are separated chromatographically,then converted into inorganic As by passing through a UV photochemical reactor followed by AsH3 generation andCL reaction with ozone (Anal. Chem. 79 (2007) 9197-9204). In the present paper we describe the measurement ofAs in different soil and dust samples by serial extraction with water, citric acid, sulfuric acid and nitric acid. Wealso compare parallel measurements for total As by induction coupled plasma mass spectrometry (ICP-MS).As(V) was the only species found in our samples. The ICP-MS results were highly correlated with direct GPCLand LC-GPCL results (r2 = 0.xxxx and 0.xxxx, respectively). The limit of detection (LOD) in the extracts was0.36 g/L by direct GPCL compared to 0.1 g/L by ICP-MS. In sulfuric acid based extracts, the LC-GPCLmethod provided LODs inferior to those previously observed for water based standards and were 2.6, 1.3, 6.7 ,and6.4 μg/L for As(III), As(V), dimethylarsinic acid (DMA) and monomethylarsonic acid (MMA) respectively.</p>ar
dc.identifier.urihttps://hdl.handle.net/20.500.11888/9448
dc.titleMeasurement of Soil/Dust Arsenic by Gas-Phase Chemiluminescenceen
dc.titleMeasurement of Soil/Dust Arsenic by Gas-Phase Chemiluminescencear
dc.typeOther
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International Graduate Conference on Science, Humanities and Engineering 2011 (IGCSHE2011)