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钒是地壳中最丰富的元素之一,排列第九,每克泥土中的平均含量约150微克。钒在钢铁、化工等领域有广泛的用途。在非经常接触的条件下,尿液中的钒含量很低,一般在2微克/升以下。当经常接触时,其含量升高。因此,测定尿中钒的任何方法必须具有与0—2微克/升这个数字相当的测量极限。Daniel C.Paschal提出的方法能满足这一要求,是一种快速、直接地测定尿中钒的手段。尿样用2.0％(容积百分比)硝酸和0.001％(容积百分比)三硝基甲苯X-100稀释,并用塞曼效应石墨炉原子吸收法测定吸收系数。这个方法的高灵敏度足以用来鉴定基础研究中的“正常”试验材料,或监测环境
Vanadium is one of the most abundant elements in the crust, ranking ninth, with an average content of about 150 micrograms per gram of soil. Vanadium in the steel, chemical and other fields have a wide range of uses. In the case of non-regular contact, the vanadium content in the urine is very low, typically below 2 μg / L. When exposed frequently, its content increases. Therefore, any method of determining vanadium in urine must have a measurement limit comparable to that of 0-2 microgram / liter. The method proposed by Daniel C.Paschal to meet this requirement is a rapid and direct measure of vanadium in the urine. Urine samples were diluted with 2.0% by volume of nitric acid and 0.001% by volume of trinitrotoluene X-100, and the absorption coefficient was determined by Zeeman effect graphite furnace atomic absorption spectrometry. This method is highly sensitive enough to identify “normal” test materials in basic research or to monitor the environment