YS/T 1341.2-2019 in English

Standard Technical Background

This standard, as the second part of the YS/T 1341 series, is formulated to meet the demand for accurate determination of lead content in crude zinc. With the upgrading of non-ferrous metal smelting technology, the requirements for raw material impurity control are becoming increasingly stringent, and traditional chemical analysis methods can no longer meet the requirements of modern production quality control.

Principle and technical indicators of the method

Analysis of key points of operation

Quality control requirements

The standard particularly emphasizes three quality control measures:

1. The linear verification of the working curve requires the absorbance ratio of the highest segment to the lowest segment to be ≥0.7
2. Background correction must use a deuterium lamp or Zeeman method
3. Each batch of samples must be accompanied by a quality control sample and the result must be within the range of ±5% of the certificate value

Industry application value

This method has been promoted and applied in major domestic zinc smelting companies such as Zhongjin Lingnan and Yuguang Gold and Lead. Compared with the traditional EDTA titration method:

• Analysis efficiency is increased by 3-5 times
• Human error is reduced by 60%
• It can meet the needs of raw material acceptance and process control at the same time

Implementation suggestions

Pay special attention to the following when implementing in the laboratory:

1. Regularly calibrate the optical system and nebulization efficiency of the atomic absorption spectrometer
2. Maintain the acetylene-air ratio between 1:4 and 1:6
3. Insert standard points for verification after every 20 samples