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一、前言钼、钒等元素为某些固氮菌所必需,许多迹象表明它们担负着一定的生物学功能。如海鞘类动物的血细胞中钒含量高达4％,它通过氧来运载血氧。缺钼的土壤,豆科植物将难以正常生长。人体中含钼与钒的量,分别为0.1ppm和0.3ppm,而钨又是一个能置换钼的元素。因此对于水中钼、钨、钒的测定,越来越引起人们的关注。由于钼、钨和钒在水中的含量极微,一般的化学分析方法,往往达不到痕量分析的要
First, the preface Molybdenum, vanadium and other elements necessary for some nitrogen-fixing bacteria, many signs that they are responsible for a certain degree of biological function. Ascidian blood cells in the vanadium content of up to 4%, it carries oxygen through oxygen. Molybdenum soil, legumes will be difficult to grow normally. The body contains molybdenum and vanadium in amounts of 0.1 ppm and 0.3 ppm, respectively, while tungsten is an element that replaces molybdenum. Therefore, the determination of molybdenum, tungsten and vanadium in water has drawn more and more attention. Due to the extremely low levels of molybdenum, tungsten and vanadium in water, typical methods of chemical analysis often do not provide trace analysis