Cary E E, Rutzke M
J Assoc Off Anal Chem. 1983 Jul;66(4):850-2.
This method involves sample digestion in nitric, perchloric, and sulfuric acids. Chromium is concentrated by coprecipitation with ferric hydroxide. Redissolved iron is removed by liquid-liquid extraction, remaining silica is dissolved with hydrofluoric acid, and chromium is determined by electrothermal atomic absorption spectrometry. The sensitivity and detection limits for chromium approach those given by the manufacturers of the various instruments. Recovery studies and analysis of standard materials show that this method is reliable.
该方法包括在硝酸、高氯酸和硫酸中对样品进行消解。铬通过与氢氧化铁共沉淀进行富集。通过液 - 液萃取去除重新溶解的铁，用氢氟酸溶解剩余的二氧化硅，然后用电热原子吸收光谱法测定铬。铬的灵敏度和检测限接近各种仪器制造商给出的值。回收率研究和标准物质分析表明该方法可靠。
