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2012•Zhongguo tiaoweipinRequires access

Spectrophotometric Determination of Lead in Foods with Methyl Thymol Blue

Deliang Fu

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Abstract

Objective: The aim was to explore a spectrophotometric method for the determination of trace lead in foods.Method: A spectrophotometric method for the determination of trace lead was developed.It was based on the fact that trace lead reacted with methyl thymol blue in the presence of brominated cetyl pyridine.Result: In the buffer solution of potassium hydrogen phthalate-sodium hydroxide,lead could form blue complex with methyl thymol blue(MTB).The maximum absorption of the complex occurred at 605 nm.The apparent molar absorptivity was 2.6×104L/mol·cm and Beer′s law was obeyed in the range of 0~7.2μg/mL.Values of RSD(n=6) were found 1.5%~3.2%,and values of recovery found by standard addition method were in the range of 96.3%~102.7%.Conclusion: The method had good accuracy and precision.It was a convenient and reliable method for the determination of trace lead in foods.

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What this paper is about

Objective: The aim was to explore a spectrophotometric method for the determination of trace lead in foods.Method: A spectrophotometric method for the determination of trace lead was developed.It was based on the fact that trace lead reacted with methyl thymol blue in the presence of brominated cetyl pyridine.Result: In the buffer solution of potassium hydrogen phthalate-sodium hydroxide,lead could form blue complex with methyl thymol blue(MTB).The maximum absorption of the complex occurred at 605 nm.The apparent molar absorptivity was 2.6×104L/mol·cm and Beer′s law was obeyed in the range of 0~7.2μg/mL.Values of RSD(n=6) were found 1.5%~3.2%,and values of recovery found by standard addition method were in the range of 96.3%~102.7%.Conclusion: The method had good accuracy and precision.It was a convenient and reliable method for the determination of trace lead in foods.

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Available abstract

Objective: The aim was to explore a spectrophotometric method for the determination of trace lead in foods.Method: A spectrophotometric method for the determination of trace lead was developed.It was based on the fact that trace lead reacted with methyl thymol blue in the presence of brominated cetyl pyridine.Result: In the buffer solution of potassium hydrogen phthalate-sodium hydroxide,lead could form blue complex with methyl thymol blue(MTB).The maximum absorption of the complex occurred at 605 nm.The apparent molar absorptivity was 2.6×104L/mol·cm and Beer′s law was obeyed in the range of 0~7.2μg/mL.Values of RSD(n=6) were found 1.5%~3.2%,and values of recovery found by standard addition method were in the range of 96.3%~102.7%.Conclusion: The method had good accuracy and precision.It was a convenient and reliable method for the determination of trace lead in foods.

Key concepts: Chemistry, Molar absorptivity, Thymol, Spectrophotometry, Chromatography, Sodium hydroxide, Potassium hydroxide, Detection limit

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