Deepa K, Lingappa Y
Department of Chemistry, Sri Venkateswara University, Tirupati 517501, Andhra Pradesh, India.
Department of Chemistry, Sri Venkateswara University, Tirupati 517501, Andhra Pradesh, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Apr 24;124:102-7. doi: 10.1016/j.saa.2013.12.030. Epub 2013 Dec 30.
2,4-Dihydroxy benzophenone-2-amino thiophenol (BPBT) has been proposed as new analytical reagent for the direct non-extractive spectrophotometric determination of arsenic. The reagent reacts with arsenic in acidic medium (pH=6.0, sodium acetate-acetic acid buffer) to form light greenish yellow colored 1:1 (M:L) complex. Maximum absorbance was obtained at 343 nm and remains constant for over 24 h. The molar absorptivity and Sandell's sensitivity of BPBT are found to be 6.01×10(4) L mol(-1)cm(-1) and 0.0016 μg cm(-2) respectively. The system obeys Beer's law in the range of 0.125-2.637 μg/ml of As (III). Since BPBT method is more sensitive, it was applied for the determination of arsenic in some environmental water samples.
2,4-二羟基二苯甲酮-2-氨基硫酚（BPBT）已被提议作为直接非萃取分光光度法测定砷的新型分析试剂。该试剂在酸性介质（pH = 6.0，醋酸钠-醋酸缓冲液）中与砷反应，形成浅黄绿色的1:1（金属离子：配体）络合物。在343 nm处获得最大吸光度，并且在24小时以上保持恒定。发现BPBT的摩尔吸光系数和桑德尔灵敏度分别为6.01×10⁴ L mol⁻¹cm⁻¹和0.0016 μg cm⁻²。该体系在0.125 - 2.637 μg/ml的As（III）范围内符合比尔定律。由于BPBT法更灵敏，因此将其应用于一些环境水样中砷的测定。
