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采用加入非离子表面活性剂的方法，不但提高了锌试剂测定铜的灵敏度，而且提高了分析选择性。其表现摩尔吸光系数为２．５×１０￣４，０～２．０μｇＣｕ／ｍｌ时遵从比尔定律。大量的Ｚｎ、Ｎｉ、Ｃｏ等不再干扰铜的测定，该法用于铝合金、锌合金中铜的测定，结果满意。
Adopting the method of adding non-ionic surfactant not only improves the sensitivity of the zinc reagent in determining copper but also improves the selectivity of the analysis. Its performance molar absorption coefficient of 2.5 × 10 ~ 4,0 ~ 2.0μgCu / ml obey Bill’s law. A large amount of Zn, Ni, Co and so on will no longer interfere with the determination of copper. This method is used for the determination of copper in aluminum alloy and zinc alloy with satisfactory results.