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MULTIWAVELENGTH ABSORPTIOPHOTOMETRIC DETERMINATION OF COPPER IRON AND ZINC IN HUMAN HAIR BY THE K - COEFFICIENT-LINEAR REGRESSION METHOD

Chen Li

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Abstract

A new multiwavelength absorptiophotometric method by the combined use of K -coefficient and linear regression is described and it is applied to the simultaneous determination of copper, iron and zinc in human hair with satisfactory results. The color reagent 5-Br-PADAP in the presence of the non-ionic surfactant OP is used in the color reaction of the above mentioned metal ions. The RSD′s ( n =8) found for zinc, copper and iron are 0.59%, 4.95% and 1.25% respectively. Recovery tests are made by the standard addition method and the average results ( n =8) obtained are 95.0% (for Zn 2+ ), 105.0% (for Cu 2+ ) and 97.5% (for Fe 3+ ). The proposed method has the special feature of simplicity, high sensitivity and good selectivity.

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What this paper is about

A new multiwavelength absorptiophotometric method by the combined use of K -coefficient and linear regression is described and it is applied to the simultaneous determination of copper, iron and zinc in human hair with satisfactory results. The color reagent 5-Br-PADAP in the presence of the non-ionic surfactant OP is used in the color reaction of the above mentioned metal ions. The RSD′s ( n =8) found for zinc, copper and iron are 0.59%, 4.95% and 1.25% respectively. Recovery tests are made by the standard addition method and the average results ( n =8) obtained are 95.0% (for Zn 2+ ), 105.0% (for Cu 2+ ) and 97.5% (for Fe 3+ ). The proposed method has the special feature of simplicity, high sensitivity and good selectivity.

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Available abstract

A new multiwavelength absorptiophotometric method by the combined use of K -coefficient and linear regression is described and it is applied to the simultaneous determination of copper, iron and zinc in human hair with satisfactory results. The color reagent 5-Br-PADAP in the presence of the non-ionic surfactant OP is used in the color reaction of the above mentioned metal ions. The RSD′s ( n =8) found for zinc, copper and iron are 0.59%, 4.95% and 1.25% respectively. Recovery tests are made by the standard addition method and the average results ( n =8) obtained are 95.0% (for Zn 2+ ), 105.0% (for Cu 2+ ) and 97.5% (for Fe 3+ ). The proposed method has the special feature of simplicity, high sensitivity and good selectivity.

Key concepts: Reagent, Zinc, Copper, Chemistry, Linear regression, Pulmonary surfactant, Metal ions in aqueous solution, Correlation coefficient

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MULTIWAVELENGTH ABSORPTIOPHOTOMETRIC DETERMINATION OF COPPER IRON AND ZINC IN HUMAN HAIR BY THE K - COEFFICIENT-LINEAR REGRESSION METHOD — Research Paper | ScholarLens