The result showed that the mutagenecity of water increased in all samples t reated with chlorine , while mutagenic potential was negative in source water samples not t reated with chorine.

• 水样采自某单位自备水源。试验结果表明,未氯化自来水有机提取物致突变反应阴性,加氯自来水样诱发沙门氏菌致突变率升高;