中文摘要：

在弱酸性至弱碱性介质中，羧甲基纤维素钠（CMC）由于多个羧基离解而以大阴离子状态存在，它能与CTMAB借静电引力和疏水作用而形成离子缔合物，此时，溶液的吸收光谱发生变化，Triton-X100对体系有增敏作用。最大吸收波长位于240nm处。建立了一种紫外分光光度法测定CMC的新方法，最大摩尔吸光系数达6.73×10^6L·mol^-1·cm^-1。方法可用于石油钻井废弃泥浆中CMC的紫外分光光度法测定。

英文摘要：

In weak acidic or basic media, sodium carboxymethyl cellulose （CMC）, owing to dissociation of its carboxyl groups to produce big negative ions, formed ion association complexes with the quaternary ammonium salt positive ion through electrostatic and hydrophobic interaction. While the absorption spectrum changes and Triton-X100 can increase the sensitivity of the system. A significant absorption is at 240 nm with CMC. The reactions show very high sen-sitivities with the absorptivity of 6.73×10^6L·mol^-1·cm^-1. This method can be applied to the spectrophotometric determination of trace CMC in the centrifugate of the drilling mud.