YS/T 990.4-2014 in English
VALIDMethods for chemical analysis of copper matte―Part 4:Determination of bismuth content―Atomic absorption spectrometry
- Issued on:2014-10-14
- Implemented on:2015-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
本部分规定了冰铜中铋量的测定方法。
本部分适用于冰铜中铋量的测定。测定范围：0.10%～0.50%。
Introduction
Analysis of the core content of the standard
This part specifies the standard method for determining the bismuth content in matte by atomic absorption spectrometer, with a detection lower limit of 0.10% and an upper limit of 0.50%. The method uses air-acetylene flame with a characteristic wavelength of 223.1 nm.
Detailed explanation of technical principles
| Key parameters | Indicator requirements | Technical significance |
|---|---|---|
| Characteristic concentration | ≤0.20 μg/mL | Ensure instrument sensitivity |
| Precision | RSD≤0.3%~0.5% | Ensure measurement repeatability |
| Linear range | Segment difference ratio≥0.70 | Verify the reliability of the working curve |
Key steps of operation
Sample treatment:Use the hydrochloric acid-nitric acid-bromine mixed decomposition method. When the silicon content is high, 0.5g potassium fluoride needs to be added. The dissolution process needs to be controlled at low temperature to avoid boiling.
Standard curve: Prepare a 0~6.00 μg/mL gradient standard solution, and keep the nitric acid medium concentration at 10% to ensure matching with the sample matrix.
Implementation points
1. The preheating time of the hollow cathode lamp should be ≥30 minutes
2. The acetylene flow rate is recommended to be controlled at 1.5-2.0 L/min
3. The sample particle size must pass through a 100 mesh sieve (≤100μm)
Standard evolution background
As the fourth standard in the YS/T 990 series, this part, together with the fire assay method (Part 2) and the hydride generation method (Part 8), constitutes a complete matte detection system, reflecting the transformation of my country's non-ferrous metal analysis technology from traditional wet chemistry to instrumental analysis.
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