YS/T 227.1-2010Methods for chemical analysis of tellurium. Part 1: Determination of bismuth content. Hydride generation-atomic fluorescence absorption spectrometry (English PDF)

Foreword

YS/T 227 "tellurium chemical analysis methods," a total of 12 parts.

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

--- Part 2. Determination of aluminum content Chromazurol S- bromo cylpyridinium micellar solubilization spectrophotometry;

--- Part 3. Determination of lead content by flame atomic absorption spectrometry;

--- Part 4. Determination of iron content - Phenanthroline spectrophotometric method;

--- Part 5. determination of selenium content of 2,3-diaminonaphthalene spectrophotometry;

--- Part 6. Determination of copper content of solid-liquid separation - flame atomic absorption spectrometry;

--- Part 7. Determination of sulfur content by inductively coupled plasma atomic emission spectrometry;

--- Part 8. magnesium, sodium content - Flame atomic absorption spectrometry;

--- Part 9. Determination of tellurium content of potassium dichromate - ammonium ferrous sulfate volumetric method;

--- Part 10. Determination of arsenic content by hydride generation - atomic fluorescence spectrometry;

--- Part 11. Determination of silicon content of n-butanol silicon molybdenum blue spectrophotometric method;

--- Part 12. bismuth, aluminum, lead, iron, selenium, copper, magnesium, sodium, arsenic content - Inductively coupled plasma atomic emission spectrometry.

This is Part 1.

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

"Determination of the amount of bismuth telluride (potassium iodide, dimethyl brucine photometric method)" in this section instead of YS/T 227.1-1994. versus YS/T 227.1-1994 compared, this section has the following changes.

--- Changed the measurement method using hydride generation - atomic fluorescence spectrometry;

--- Expands the measurement range, modify 0.0001% 0.0025%;

--- 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.

This section is responsible for drafting unit. Zhuzhou Smelter Group Co., Ltd.

This section is drafted. Beijing General Research Institute of Mining and Metallurgy.

It participated in the drafting of this section. Zhuzhou Smelter Group Co., Ltd., Liaoning Entry Inspection and Quarantine Bureau.

1 Scope

YS/T of the provisions of the section 227 determination of tellurium content of bismuth.

This section applies to the determination of bismuth tellurium content. Measurement range. 0.0001% to 0.0025%.

2 Principle of the method

Samples with hydrochloric acid, nitric acid dissolved in hydrochloric acid medium, sulfite reduction tellurite to tellurium acid precipitation to remove the matrix, using a hydride - atomic fluorescence Spectrophotometer Determination of bismuth content.

3 Reagents

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

3.1 nitrate (rho1.43g/mL), pure class distinctions.

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

3.3 hydrochloride (11).

3.4 hydrochloric acid, 20% (volume fraction).

3.5 sulfurous acid (sulfur dioxide containing not less than 6.0%).

3.6 ascorbic acid solution (100g/L).

3.7 solution of potassium borohydride (10g/L). Weigh 10g of potassium borohydride dissolved in 1000mL potassium hydroxide solution (5g/L), a shake. Active Now equipped.

3.8 bismuth standard stock solution. Weigh 0.1000g bismuth (>=99.95%), plus 10mL of nitric acid (11), low temperature heating is completely dissolved, add Into 50mL of nitric acid (3.1), cooled and transferred to 1000mL volumetric flask with water to volume, and mix. This solution 1mL containing 0.10mg bismuth.

3.9 Bismuth standard solution. Pipette 2.00mL bismuth standard stock solution (3.8) in 200mL volumetric flask, dilute to the mark with hydrochloric acid (14), shake uniform. This solution 1mL containing 1.0µg bismuth.

4 Instrument

Atomic fluorescence spectrometer, with high-intensity hollow cathode lamp bismuth.

Under optimum working conditions, where the index can be used to achieve the following.

--- Detection limit. not more than 2 × 10-9g/mL.

--- Precision. measuring the fluorescence intensity of 10 times with a bismuth standard solution 0.02µg/mL, which should not exceed the standard deviation of the mean fluorescence intensity 5.0%.