休哈特控制图在总大肠菌群检测中的应用

Application of Shewhart Control Chart in Total Coliforms Detection

针对滤膜法和酶底物法检测总大肠菌群的过程,休哈特控制图可以用来监测其是否受控。判定受控后,选取太原市60个二次供水实际样品,分别采用滤膜法和酶底物法对其中的总大肠菌群进行测定。结果显示,两种检测方法均测得2个阳性样品,总大肠菌群阳性率为3.3%。对阳性结果中的大肠菌群进行了初步鉴定,分别为肠杆菌科克雷伯菌属的新加坡克雷伯氏菌(Klebsiella singaporensis)和勒克菌属的非脱羧勒克菌(Leclercia adecarboxylata),无假阳性。

Shewhart control chart could be used to monitor the control of total coliforms by membrane filter technique and enzyme substrate technique.After controlled,60 samples of secondary water supply in Taiyuan were selected to be determined total coliforms by membrane filter technique and enzyme substrate technique respectively.Results showed that two positive samples were detected by both methods,and the positive rate of total coliforms was 3.3%.The positive results were identified as Enterobacteriaceae Klebsiella singaporensis and Enterobacteriaceae Leclercia adecarboxylata,false positives were not found.