YS/T 276.3-2011Methods for chemical analysis of indium. Part 3: Determination of thallium content. Methyl green photometric method (English PDF)

Foreword

YS/T 276 "indium chemical analysis methods," including a total of 11 parts.

--- Part 1. Determination of arsenic content by hydride generation - atomic fluorescence spectrometry;

--- Part 2. Determination of tin content Phenylfluorone - bromo cetyl trimethylamine spectrophotometry;

--- Part 3. Determination of the amount of thallium methyl green spectrophotometry;

--- Part 4. Determination of the amount of chrome aluminum Azure S Spectrophotometry;

--- Part 5. Determination of iron content of 1. electrothermal atomic absorption spectrometry Method 2. Flame atomic absorption spectrometry;

--- Part 6. copper, cadmium, zinc content - Flame atomic absorption spectrometry;

--- Part 7. Determination of lead content by flame atomic absorption spectrometry;

--- Part 8. Determination of bismuth content 1. Hydride Generation - Atomic Fluorescence Spectrometry Method 2. Flame atomic absorption spectrometry;

--- Part 9. Determination of the amount of indium Na2EDTA titration;

--- Part 10. bismuth, aluminum, lead, iron, copper, cadmium, tin, thallium content - Inductively coupled plasma atomic emission spectrometry;

--- Part 11. arsenic, aluminum, lead, iron, copper, cadmium, tin, thallium, zinc, bismuth content - Inductively Coupled Plasma Mass Spectrometry.

This section drafted in accordance with the rules of GB/T 1.1 is given.

This section YS/T Part 3 276.

The partial replacement of YS/T 276.3-1994 "indium chemical analysis of methyl green spectrophotometric determination of the amount of thallium Law", and YS/T 276.3-Compared to 1994, this section has the following changes.

--- Measuring range extended from 0.0005% ~ .0120 to .00030% to 0.100%;

--- Complements the precision, quality assurance and control provisions;

--- Complements the "test report" requirement.

The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.

1 Scope

This section YS/T 276 specifies the method for determination of indium thallium content.

This section applies to the determination of indium thallium content. Determination of the range of 0.00030% to 0.100%.

2 Principle of the method

Sample decomposition with hydrochloric acid, in 0.008mol/L ~ 0.24mol/L solution of hydrogen bromide, thallium and methyl green violet complex generated by Isoamyl acetate extraction, the absorbance is measured in a spectrophotometer at a wavelength of 610nm.

3 Reagents

Unless otherwise indicated, used in the analysis confirmed only for the gifted class pure reagents and distilled or deionized water or equivalent purity.

3.1 isoamyl acetate.

3.2 hydrochloric acid (rho = 1.19g/mL).

3.3 hydrochloric acid solution (11).

3.4 hydrobromide (rho = 1.42g/mL).

3.5 hydrobromic acid solution (1mol/L). Pipette 75mL hydrobromic acid (3.4), 10mL of saturated bromine water to brown 500mL volumetric flask, washed with water Dilute to volume, and mix.

3.6 sulfosalicylic acid solution (100g/L).

3.7 methyl green solution (5g/L).

3.8 thallium standard stock solution. Weigh 0.2607g thallium nitrate reference reagent, a 50mL beaker, dissolved in water and transferred to 1000mL Volumetric flask, dilute with water to volume, and mix. This solution 1mL containing 200µg thallium.

3.9 Thallium standard solution. Pipette 10.00mL thallium standard stock solution (3.8) in 1000mL volumetric flask, dilute to the mark with water, mix uniform. This solution 1mL containing 2µg thallium.

4 Instrument

Spectrophotometer.

5 Sample

The sample was processed into a side grow up to 3mm in the form of chips.