在pH=10.5的NH3-NH4Cl缓冲溶液中和氯化十四烷基二甲基苄基銨存在下,Ag(Ⅰ)与二乙基二硫代氨基甲酸钠(DDTC)可形成较稳定的(Ag-DDTC)n螯合物微粒. 它在361 nm处产生1个共振散射峰,在464 nm处产生1个同步散射峰. 当激发波长为260 nm时,它在400和466 nm处产生2个荧光峰. 在一定条件下,Ag(Ⅰ)浓度在4.3×10-8～3.24×10-6 g/mL之间均与共振散射强度I361 nm和荧光强度F400 nm呈线性关系. 据此建立了一个检测限为1.0×10-8 g/mL Ag的共振散射新方法. 该方法应用于照片和定影液废水中微量银的测定,结果满意.
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