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采用微波消解样品,石墨炉原子吸收光谱法测定荸荠及荸荠皮中铅和镉的含量。选定最佳的样品处理方法,并优化微波消解条件和仪器测定条件,对各种最佳分析条件进行了探讨和验证。研究表明,铅、镉的检出限分别为0.171、0.026μg/L;线性范围分别为0~60μg/L、0~4.0μg/L;加标回收率分别为94.0%~101.0%、92.0%~106.0%;RSD分别为4.2%、3.7%。用标准物质进行对照,其测定值均在给定的标准值范围内。
The contents of lead and cadmium in water chestnuts and water chestnuts were determined by microwave digestion and graphite furnace atomic absorption spectrometry. Selected the best sample processing methods, and optimize the microwave digestion conditions and instrument determination conditions, the best analysis of various conditions were discussed and verified. The results showed that the detection limits of lead and cadmium were 0.171,0.026μg / L, respectively. The linear ranges were 0-60μg / L and 0-4.0μg / L respectively. The recoveries were 94.0% -101.0%, 92.0% ~ 106.0%; RSD was 4.2% and 3.7% respectively. Control with reference material, the measured values are within the given standard value range.