What quantitative methods are commonly used for trace impurity analysis in pure substances?
Trace impurity quantitative analysis in pure substances can be performed using the following methods:
1. High Performance Liquid Chromatography (HPLC):
Utilizes different retention times of compounds in the chromatography column to separate and quantify trace impurities. Suitable for most organic and some inorganic impurities.
2. Gas Chromatography (GC):
Suitable for trace analysis of volatile and semi-volatile organic compounds. Identification and quantification are based on the retention times of different compounds in the column.
3. Mass Spectrometry (MS):
Used in conjunction with liquid or gas chromatography, provides accurate molecular weight and structural information for qualitative and quantitative analysis of trace impurities.
4. Atomic Absorption Spectroscopy (AAS):
Suitable for the analysis of trace metal impurities. Quantitative analysis is performed by measuring the extent to which light at specific wavelengths is absorbed by the sample.
5. Inductively Coupled Plasma Mass Spectrometry (ICP-MS):
Suitable for the analysis of ultra-trace elements, especially metal and non-metal impurities. Offers extremely high sensitivity and a wide range of elemental coverage.
6. X-ray Fluorescence Spectroscopy (XRF):
Used for non-destructive testing and quantitative analysis of elemental composition in solid samples.
These methods are selected based on required sensitivity, sample type, and available equipment. In practice, multiple techniques are often combined to ensure comprehensive and accurate analysis.
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