GB/T 6150.10-2023

Methods of chemical analysis of tungsten concentrates - Part 10: Determination of lead content by hydride generation atomic fluorescence spectrometry and flame atomic absorption spectrometry (English Version)

Standard No.: GB/T 6150.10-2023
Language: Chinese, Available in English version
Release Date: 2023
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 6150.10-2023
Replace: GB/T 6150.10-2008

Scope: This document specifies the method for determining the lead content in tungsten concentrate. This document is applicable to the determination of lead content in tungsten concentrate, including two methods (Method 1: hydride generation atomic fluorescence spectrometry; Method 2: flame atomic absorption spectrometry). Method 1 measurement range (mass fraction): 0.0010%~0.30%; Method 2 measurement range (mass fraction): 0.10%~0.50%. Method 2 is used as the arbitration method for the overlapping measurement range.

Introduction

1. Standard Background and Technological Evolution

GB/T 6150.10-2023 is a revised version of the original standard GB/T 6150.10-2008, mainly for the determination of lead content in tungsten concentrate. The new version introduces hydride generation atomic fluorescence spectrometry (HG-AFS) and retains the original flame atomic absorption spectrometry (FAAS). This improvement makes the standard more applicable and more sensitive.

2. Comparative Analysis of Methods

Method Name	Detection Limit	Applicable Concentration Range	Sensitivity	Operation Complexity
Hydride Generation Atomic Fluorescence Spectrometry (HG-AFS)	0.1 ng/mL	0.0010%~0.30%	High, suitable for low concentration detection	Medium complexity
Flame Atomic Absorption Spectrometry (FAAS)	0.1 μg/mL	0.10%~0.50%	Medium, suitable for high concentration detection	Low complexity

3. Principle and steps of the method

Hydride generation atomic fluorescence spectrometry (HG-AFS)

The sample is decomposed in an acidic medium. After adding a masking agent and an oxidant, lead is reduced to hydride by potassium borohydride, and its fluorescence intensity is measured on an atomic fluorescence spectrometer. The mass concentration of lead is determined by the working curve.

Flame atomic absorption spectrometry (FAAS)

After the sample is decomposed in hydrochloric acid and nitric acid, the absorbance of lead is measured in an air-acetylene flame, and its mass concentration is determined using a standard curve.

4. Implementation Recommendations

Method Selection:Choose an appropriate method based on the expected range of lead content in the sample. HG-AFS is suitable for low-concentration detection, and FAAS is suitable for high-concentration detection.
Sample Preparation:Ensure that the sample particle size is uniform and test after drying to avoid interference.
Quality Control:Calibrate the instrument regularly, perform working curve verification using standard solutions, and perform blank tests to exclude matrix effects.

GB/T 6150.10-2023 Referenced Document

GB/T 17433 Foundation terms for chemical analysis of metallurgical products
GB/T 6682 Water for analytical laboratory use.Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values

GB/T 6150.10-2023 history

2023 GB/T 6150.10-2023 Methods of chemical analysis of tungsten concentrates - Part 10: Determination of lead content by hydride generation atomic fluorescence spectrometry and flame atomic absorption spectrometry
2009 GB/T 6150.8-2009 Methods for chemical analysis of tungsten concentrates-Determination of molybdenum content-The thiocyanate spectrophotometry
2008 GB/T 6150.10-2008 Methods for chemical analysis of tungsten concentrates.Determination of lead content.Flame atomic absorption spectrometric method
1985 GB/T 6150.10-1985 Methods for chemical analysis of tungsten concentrates--The thiocyanate photometric method for the determination of molybdenum content

GB/T 6150.10-2023 -All Parts