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Study on Solid Phase Extraction and Spectrophotometric Determination of Lead in Environmental Samples with p-Carboxylphenylazo-Thiorhodanine

WU Xian-hua, Guangyu Yang

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Abstract

A new chromogenic reagent, p-carboxylphenylazo-thiorhodanine(CPATR) was synthesized, and its structure was verified by elemental analysis, IR and HNMR. The color reaction of lead with CPATR was studied in this paper. In the presence of pH=3.8 HAc-NaAc buffer solution and tween-80 medium. CPATR can react with lead to form a stable 2∶1 comples. This complex can be extracted by waters Sep-Pak-C(18) cartridge and eluted the retained chelate from cartridge with ethanol. The molar absorptivity is 8.01×10~4 L·mol~(-1)·cm~(-1) at 500 nm. Beer's law is obeyed in range of 0.05～4 mg/L. This method can be applied to the determination of lead in environmental samples with satisfactory results.

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What this paper is about

A new chromogenic reagent, p-carboxylphenylazo-thiorhodanine(CPATR) was synthesized, and its structure was verified by elemental analysis, IR and HNMR. The color reaction of lead with CPATR was studied in this paper. In the presence of pH=3.8 HAc-NaAc buffer solution and tween-80 medium. CPATR can react with lead to form a stable 2∶1 comples. This complex can be extracted by waters Sep-Pak-C(18) cartridge and eluted the retained chelate from cartridge with ethanol. The molar absorptivity is 8.01×10~4 L·mol~(-1)·cm~(-1) at 500 nm. Beer's law is obeyed in range of 0.05～4 mg/L. This method can be applied to the determination of lead in environmental samples with satisfactory results.

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Available abstract

A new chromogenic reagent, p-carboxylphenylazo-thiorhodanine(CPATR) was synthesized, and its structure was verified by elemental analysis, IR and HNMR. The color reaction of lead with CPATR was studied in this paper. In the presence of pH=3.8 HAc-NaAc buffer solution and tween-80 medium. CPATR can react with lead to form a stable 2∶1 comples. This complex can be extracted by waters Sep-Pak-C(18) cartridge and eluted the retained chelate from cartridge with ethanol. The molar absorptivity is 8.01×10~4 L·mol~(-1)·cm~(-1) at 500 nm. Beer's law is obeyed in range of 0.05～4 mg/L. This method can be applied to the determination of lead in environmental samples with satisfactory results.

Key concepts: Molar absorptivity, Chromogenic, Reagent, Chemistry, Elution, Solid phase extraction, Cartridge, Extraction (chemistry)

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