1963年用含有DAM(二安替比林甲烷)的苯:氯仿的体积比为1:1的混合液萃取金属硫氰酸盐络阴离子时发现钨等15种元素被富集在第三相(或称微有机相)。第三相萃取除了可自较大体积中将微克量组份富集到体积约为1—2毫升的第三相中以便于光谱测定等特点之外,还具有比二相萃取更能完全富集微量元素的优点。目前,国内迄今未见文献报导。文献曾报导了利用第三相萃取可用化学光谱法测定钴。本报告除了建立钴的第 In 1963, when the metal thiocyanate complex anion was extracted by a 1: 1 mixture of benzene and chloroform containing DAM (diantipyrylmethane), 15 kinds of elements such as tungsten were found in the third phase Or micro-organic phase). The third phase extraction, in addition to being able to concentrate micrograms of the components from a larger volume into the third phase with a volume of about 1-2 ml for spectrometry and the like, also has more complete enrichment than biphasic extraction Set the advantages of trace elements. At present, no literature has been reported in China so far. The literature has reported the use of the third phase extraction chemical spectrophotometric determination of cobalt. This report in addition to the establishment of the first cobalt