散射光浊度仪用于金属清净剂浊度的测定研究

采用HACH2100和M-151型散射浊度仪，对润滑油金属清净剂烷基苯磺酸钙、硫化烷基酚钙、烷基水杨酸钙、环烷酸钙样品的浊度进行测定及研究。结果表明，用HACH2100AN测定时，随着样品中金属清净剂浓度的增加，浊度呈现增加、减少、有最大值3种变化趋势，其中转换模式开启时增加的数量多，当样品中清净剂质量分数为20%时，仪器的测定结果更加接近真实值。此外，考察了基础油种类、样品温度对测定结果的影响，发现随着基础油种类变化，测定结果有较大的变化，温度的变化对浊度影响不大。最后结合润滑油金属清净剂胶体颗粒尺寸测定数据，验证了HACH2100测试方法的可靠性。

STUDY ON METAL DETERGENT TURBIDITY MEASUREMENT BY SCATTERED LIGHT TURBIDIMETER

Turbidimeter HACH2100AN and M-151 were used to investigate the turbidity of metal detergents of calcium alkylbenzene sulfonate, calcium sulfurized phenate, calcium alkyl salicylate and calcium naphthenate. It is found that the turbidity values of detergents change as the concentration of detergent increases in the samples: increasing, decreasing, and having maximum point when HACH2100AN turbidity instrument is used. The most increase of turbidity values occurs when the instrument is in open mode and the sample concentration is 20%，the turbidity measured is close to the real value. In addition, the effect of base oil types and operation temperature of samples on measured turbidity was also explored. The results show that the type of base oil has larger effect on turbidity measured, while the temperature has only little influence. The reliability of HACH2100AN testing method is verified by the colloid sizes data of metal detergent in lube oil.