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报道一种新的分析方法──反射光谱法直接测定沉淀物。探讨了该方法的基本原理、影响因素及测定条件。该方法直接测定沉淀物快速、简便。应用于污水及土壤样品中微量汞（Ⅱ）的测定，结果满意．
A new analytical method has been reported ─ ─ reflectance spectroscopy direct determination of sediment. The basic principle, influencing factors and measuring conditions of this method are discussed. The method of direct determination of precipitates is fast and easy. The method was applied to the determination of trace mercury (Ⅱ) in sewage and soil samples with satisfactory results.