Spectrophotometric Determination of Chloride Ion Using Mercury Thiocyanate and Iron Alum

Tetsutaro YOSHINAGA; Koki OHTA

doi:10.2116/analsci.6.57

Tetsutaro YOSHINAGA, Koki OHTA

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Keywords: Spectrophotometric determination, chloride ion, iron(III) alum, mercury thiocyanate, nitric acid, methanol

JOURNAL FREE ACCESS

1990 Volume 6 Issue 1 Pages 57-60

DOI https://doi.org/10.2116/analsci.6.57

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Published: February 10, 1990 Received: July 10, 1989 Available on J-STAGE: June 30, 2006 Accepted: September 21, 1989 Advance online publication: - Revised: -
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Date of correction: June 30, 2006 Reason for correction: - Correction: ABSTRACT Details: Wrong : Small amounts of chloride ion have been determined spectrophotometrically by means of iron(III) alum (NH₄Fe(SO₄)₂• 12H₂O) reagent solution in nitric acid and thiocyanate reagent solution in methanol. Previously developed methods using iron(III) alum and thiocyanate for determining chloride ion are not sensitive enough and/or have non-linear calibration curves. Therefore, attempts to improve these methods were made in the present work. The results are as follows. Higher linearity and better sensitivity of calibration curves were obtained with higher concentrations of iron(III) alum (150-300g/dm³ in 6M HNO₃, 2ml) and mercury thiocyanate reagents (9g/dm³ in MeOH, 2ml, or 4g/dm_{3 in MeOH, 4ml) in the chloride ion concentration of up to 20mg/dm³. The influence of light on absorbance of the solution was very small, although the temperature dependence on absorbance was relatively great. Effects of nitric acid concentration and stirring conditions were also studied.
Right : Small amounts of chloride ion have been determined spectrophotometrically by means of iron(III) alum (NH₄Fe(SO₄)₂• 12H₂O) reagent solution in nitric acid and thiocyanate reagent solution in methanol. Previously developed methods using iron(III) alum and thiocyanate for determining chloride ion are not sensitive enough and/or have non-linear calibration curves. Therefore, attempts to improve these methods were made in the present work. The results are as follows. Higher linearity and better sensitivity of calibration curves were obtained with higher concentrations of iron(III) alum (150-300g/dm³ in 6M HNO₃, 2ml) and mercury thiocyanate reagents (9g/dm³ in MeOH, 2ml, or 4g/dm³ in MeOH, 4ml) in the chloride ion concentration of up to 20mg/dm³. The influence of light on absorbance of the solution was very small, although the temperature dependence on absorbance was relatively great. Effects of nitric acid concentration and stirring conditions were also studied.}

Date of correction: June 30, 2006 Reason for correction: - Correction: PDF FILE Details: -

Abstract

Small amounts of chloride ion have been determined spectrophotometrically by means of iron(III) alum (NH₄Fe(SO₄)₂• 12H₂O) reagent solution in nitric acid and thiocyanate reagent solution in methanol. Previously developed methods using iron(III) alum and thiocyanate for determining chloride ion are not sensitive enough and/or have non-linear calibration curves. Therefore, attempts to improve these methods were made in the present work. The results are as follows. Higher linearity and better sensitivity of calibration curves were obtained with higher concentrations of iron(III) alum (150-300g/dm³ in 6M HNO₃, 2ml) and mercury thiocyanate reagents (9g/dm³ in MeOH, 2ml, or 4g/dm³ in MeOH, 4ml) in the chloride ion concentration of up to 20mg/dm³. The influence of light on absorbance of the solution was very small, although the temperature dependence on absorbance was relatively great. Effects of nitric acid concentration and stirring conditions were also studied.

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