2004•Chemical ResearchesRequires access

Determination of Trace Calcium in Chemical Reagents by Spectrophotometry

HU Wei-hua

Abstract

A new method was developed for the determination of trace calcium using DBC-chlorophosphonazo as a colour reagent. In the medium of NH_(3)-NH_(4)Cl buffer medium at pH 10.4, calcium(Ⅱ) and DBC-chlorophosphonazo form a blue complex with molar ratio of 1∶1. The apparent molar absorptivity e _(624 nm )= 3.82×10~(4) L·mol~(-1)·cm~(-1). Beer's is obeyed over the range of 0～25μg/25 mL of calcium. The method has been used in the determination of trace calcium in potassium chloride, sodium chloride and sodium nitrate chemical reagents. The results obtained were satisfactory.

About this research paper

What this paper is about

Why it matters

A significance statement is not available in the OpenAlex record.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Key concepts: Reagent, Molar absorptivity, Chemistry, Spectrophotometry, Potassium, Sodium, Calcium, Chloride