二乙基二硫代氨基甲酸钠,即铜试剂(DDTC),是一种含有(CSSNa)原子团的二硫代甲酸盐,当其钠为其它金属离子取代时,可形成象硫化物似的难溶化合物。经抽滤将这些难溶化合物收集在微孔滤膜上,就能得到适合于放射性同位素源激发X射线分析(RXF)的试样。本工作是以DDTC为有机沉淀剂,用国产0.45μm微孔滤膜为承膜,探讨了DDTC用量、溶液酸度(pH值)和载体(Fe~(3+))加入量对天然水中铁、镍、铜、锌、 Sodium diethyldithiocarbamate, the copper reagent (DDTC), is a dithiocarbamate salt containing (CSSNa) radicals. When sodium is replaced by another metal ion, it can form a sulfide-like Soluble compounds. After filtration, these poorly soluble compounds are collected on a microporous filter to obtain a sample suitable for radioisotope source excitation X-ray analysis (RXF). In this work, DDTC was used as organic precipitant, and the domestic 0.45μm microporous membrane was used as membrane. The effects of DDTC dosage, acidity (pH) and carrier (Fe 3+) Nickel, copper, zinc,