YS/T 74.8-2010Methods of chemical anaysis of cadmium. Part 8: Determination of thallium content. Crystal violet spectrophotometry (English PDF)

Foreword

YS/T 74-2010 "cadmium chemical analysis method" is divided into 11 parts.

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

--- Part 2. Determination of antimony content hydride generation - atomic fluorescence spectrometry;

--- Part 3. Determination of nickel content by electrothermal atomic absorption spectrometry;

--- Part 4. Determination of lead content by flame atomic absorption spectrometry;

--- Part 5. Determination of the amount of copper diethyl dithiocarbamate spectrophotometry lead;

--- Part 6. Determination of zinc content - Flame atomic absorption spectrometry;

--- Part 7. Determination of iron content of 1,10 phenanthroline spectrophotometry;

--- Part 8. Determination of thallium content of crystal violet spectrophotometry;

--- Part 9. Determination of tin content by hydride generation - atomic fluorescence spectrometry;

--- Part 10. Determination of the amount of silver by flame atomic absorption spectrometry;

--- Part 11. Inductively coupled plasma atomic arsenic, antimony, nickel, lead, copper, zinc, iron, thallium, tin and silver content of the emitted light Spectroscopy.

This section 8.

This section drafted in accordance with GB/T 1.1-2009 given rules.

The partial replacement of YS/T 74.8-1994 "cadmium chemical analysis of crystal violet spectrophotometric determination of the amount of thallium," this part of the original standard.

Compared to the main changes are as follows.

--- Text format has been modified;

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

--- Increase the warning prompt;

--- Increasing the test report clause.

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

This section is responsible for drafting unit. MCC Huludao Nonferrous Metals Group Co., Ltd.

This section is drafted. Zhuzhou Smelter Group Co., Ltd.

Participated in the drafting of this section. MCC Huludao Nonferrous Metals Group Co., Ltd. Shaanxi Dongling Smelting Co., Ltd., Shenzhen Jinling South Nonferrous Metals Co., Ltd. Shaoguan smelter, Henan Yuguang Gold & Lead Co., Ltd.

1 Scope

YS/T of the provisions of section 74 of the method for the determination of cadmium in the amount of thallium.

This section applies to the determination of cadmium in the amount of thallium. Measurement range. 0.0005% to 0.025%.

2 Principle of the method

In 0.05mol/L ~ 0.3mol/L HCl medium, thallium chloride anions (TlCl-4) to form a stable colored complex with crystal violet Was extracted with toluene, the spectrophotometer at a wavelength of 610nm measured absorbance.

This section does not apply to gold specimens.

3 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled water or equivalent purity.

3.1 over anhydrous sodium sulfate.

3.2 nitrate (rho1.42g/mL), pure class distinctions.

3.3 hydrochloric acid (rho1.19g/mL), pure class distinctions.

3.4 Hydrogen peroxide (30%).

3.5 toluene.

3.6 hydrochloride (11).

3.7 hydrochloric acid (0.3mol/L).

3.8 potassium permanganate solution (10g/L).

3.9 crystal violet solution (1g/L).

3.10 thallium standard stock solution. Weigh 0.1235g Thallium (I) sulfate (wTl2SO4>=99.9%) placed in 100mL beaker with water and dissolved.

Moved into 1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL containing 100µg thallium.

Warning. Thallium is highly toxic drugs, use caution.

3.11 Thallium standard solution. Pipette 50.00mL thallium standard stock solution (3.10) in 1000mL volumetric flask, dilute to the mark, mix uniform. This solution 1mL containing 5µg thallium.

4 Instrument

Spectrophotometer.