摘要
为寻找一种既能缩短时间、降低费用、减少污染,又能满足测定化学需氧量(COD)要求的方法,在硫、磷混酸中以MnSO4作催化剂,AgNO3、KCr(SO4)2.12H2O作Cl-的掩蔽剂,采用重铬酸钾氧化法,无汞快速测定COD。经实验验证,该法的最佳测定条件是:MnSO40.2g;H2SO4-H3PO420mL(H2SO4∶H3PO4=1∶2体积比);回流时间15min。
To find out a method which not only shorten time,save money and decrease pollution,but also satisfy requirements for setting out chemical oxygen demand（COD）,the CODs were quickly determined by mercury-free potassium dichromate method using MnSO4 as catalyst and AgNO3,KCr（SO4）2·12H2O as masking agent of Cl^-in sulfuric-phosphoric mixed acid.The experiments showed the best conditions of this method as： MnSO4 0.2g,H2SO4-H3PO4 20ml（H2SO4∶H3PO4=1∶2 in volume ratio）,and the circumfluence time 15min.
出处
《山东建筑大学学报》
2007年第4期347-349,共3页
Journal of Shandong Jianzhu University
关键词
化学需氧量
催化剂
掩蔽剂
chemical oxygen demand
catalyst
masking agent
