流动注射化学发光测定洗衣粉中的磷含量
Determinnation of Phosphorus in Laundry Powder by the Flow Injection Chemiluminescence

在碱性介质中,Cu2+对鲁米诺-盐酸羟胺的化学发光有明显的增敏作用,而PO3-4能与Cu2+反应生成Cu3(PO4)2沉淀,对Cu2+增敏的鲁米诺-盐酸羟胺的化学发光有抑制作用,据此建立测定洗衣粉中PO3-4的流动注射化学发光分析方法.在1.0×10-10～1.0×10-7 mol？L-1范围内,洗衣粉中PO3-4的浓度与相对发光强度有良好的线性关系,线性方程为△I=214.6 +214.6c,线性相关系数为0.999 3,检出限为1.0×10-12mol？L-1.对1.0×10-7mol？L-1的PO3-4进行11次平行测定,其相对标准偏差为1.3；.此方法用于测定洗衣粉中磷的含量,结果令人满意.
In an alkaline solution,the luminol and hydrochloric acid hydroxyl amine can create a stable chemiluminescence(CL)signal,the Cu can increase the CL signal obviously when it was poured in,and the PO4could generate the inhibit influence of Cu to this system.Method of the flowing injection chemiluminescence determination of micro amounts of PO4in washing-powder was proposed.The linear relationship between the relative CL intensity(△I)and the washing-powder concentration of PO4 was obtained well in the range of 1.0×10～1.0×10mol？L,with a detection limit of 1.0×10mol？L.By applying the analysis of 1.0×10mol？L PO4 standard solution,the value of RSD(n=11)was 1.3%.The method can be used for the determination of phosphorus in laundry powder with satisfactory result