尿中镉的浓度主要反映体内负荷,是肾中镉储存量的指标,在研究镉的职业接触中,尿镉是必须监测的生物指标之一。 尿镉的测定方法有原子吸收法、中子活化法、阳极溶出伏安法和双硫腙比色法,其中以原子吸收法最为人们所重视。用原子吸收法测定尿镉时,尿样大都需要预处理,如湿式或干式灰化法,络合萃取法,灰化与络合萃取结合等方法。近年来采用基体改进剂直接测定尿镉的方法,提高了灵敏度和分析精度。 Urine cadmium concentration mainly reflects the body burden, is an indicator of kidney cadmium storage, in the study of occupational exposure to cadmium, urinary cadmium is one of the biological indicators must be monitored. Determination of urinary cadmium atomic absorption method, neutron activation method, anodic stripping voltammetry and dithizone colorimetric method, of which the most people attach importance by atomic absorption method. Urinary cadmium when using atomic absorption spectrometry, most of the urine samples need pretreatment, such as wet or dry ashing, complex extraction, ashing and complex extraction and other methods. In recent years, the direct use of matrix modifier urine cadmium method to improve the sensitivity and accuracy.