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Spectrophotometric determination of trace lead in water samples with Pb(II)-XO system

Wang Yong-sheng

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Abstract

Xylenol orange is a very important developer in microanalysis.Pb2+ Can react with XO to form a stable 1 ∶1 complex of red color in Britton-Robinson buffer of pH 6.0.Chromogenic reaction of Pb2+-xylenol orange system was studied and a new spectrophotometric method for determining trace lead was established.The results showed that the maximum absorption wavelength is 580 nm.The apparent molar absorption coefficient is 3.312×104 L/(mol·cm).As the Pb2+ concentration is in the range of 0.075~1.2 mg/L,it follows the Beer's Law.The method had several advantages such as few procedures,mild reaction conditions easy operation,low contamination and high yield of product.The method can generally to be used.

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What this paper is about

Xylenol orange is a very important developer in microanalysis.Pb2+ Can react with XO to form a stable 1 ∶1 complex of red color in Britton-Robinson buffer of pH 6.0.Chromogenic reaction of Pb2+-xylenol orange system was studied and a new spectrophotometric method for determining trace lead was established.The results showed that the maximum absorption wavelength is 580 nm.The apparent molar absorption coefficient is 3.312×104 L/(mol·cm).As the Pb2+ concentration is in the range of 0.075~1.2 mg/L,it follows the Beer's Law.The method had several advantages such as few procedures,mild reaction conditions easy operation,low contamination and high yield of product.The method can generally to be used.

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Available abstract

Xylenol orange is a very important developer in microanalysis.Pb2+ Can react with XO to form a stable 1 ∶1 complex of red color in Britton-Robinson buffer of pH 6.0.Chromogenic reaction of Pb2+-xylenol orange system was studied and a new spectrophotometric method for determining trace lead was established.The results showed that the maximum absorption wavelength is 580 nm.The apparent molar absorption coefficient is 3.312×104 L/(mol·cm).As the Pb2+ concentration is in the range of 0.075~1.2 mg/L,it follows the Beer's Law.The method had several advantages such as few procedures,mild reaction conditions easy operation,low contamination and high yield of product.The method can generally to be used.

Key concepts: Xylenol orange, Chromogenic, Chemistry, Color reaction, Orange (colour), Buffer solution, Yield (engineering), Analytical Chemistry (journal)

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