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钢及铜合金中微量稀土的测定有用铜试剂沉淀分离—偶氮胂Ⅲ比色法,也有用偶氮氯膦Ⅲ直接比色法测定球铁、低合金钢及铝合金中稀土。但对测定铅锑合金中微量稀土,由于基体中含有大量Pb和Sb,直接采用上述方法有一定困难。 本工作研究了用DDTC沉淀分离大量铅锑与微量稀土的条件,试验了稀土的偶氮氯膦Ⅲ—溴化十六烷基三甲基铵比色测定条件,提出
Determination of trace rare earths in steel and copper alloys Useful copper reagent precipitation separation - arsenazo Ⅲ colorimetry, but also with chlorophosphonazo Ⅲ direct colorimetric determination of ductile iron, low alloy steel and aluminum alloy rare earth. However, for the determination of trace rare earths in lead-antimony alloys, it is somewhat difficult to directly adopt the above method due to the large amount of Pb and Sb contained in the matrix. In this work, the conditions for the precipitation of a large amount of lead, antimony and trace rare earths by DDTC were studied. The determination conditions of the rare earth chlorophosphonazo Ⅲ-cetyltrimethylammonium bromide colorimetric assay