Kowbel D J, Malaiyandi M, Paramasigamani V, Nestmann E R
Sci Total Environ. 1984 Aug 1;37(2-3):171-6. doi: 10.1016/0048-9697(84)90093-7.
Samples of soil fulvic acid (SFA) were ozonated and subsequently chlorinated under acidic or slightly basic conditions. The residues were tested for His+ reversion in a fluctuation assay, using Salmonella typhimurium TA100 as the tester strain. The ozonated/chlorinated samples were mutagenic, but activity was dependent on the amount of ozone utilized and the pH of the reaction medium. Although increases in cell concentrations were also induced by some mutagenic samples, this alone did not account for the mutagenicity observed. Unchlorinated samples displayed insignificant activity.
对土壤富里酸（SFA）样本进行臭氧处理，随后在酸性或弱碱性条件下进行氯化处理。使用鼠伤寒沙门氏菌TA100作为测试菌株，通过波动试验对残留物进行His+回复突变测试。经臭氧处理/氯化处理的样本具有致突变性，但其活性取决于所使用的臭氧量和反应介质的pH值。尽管一些致突变样本也会诱导细胞浓度增加，但这 alone 并不能解释所观察到的致突变性。未氯化的样本显示出微不足道的活性。
原文中“this alone”的“alone”翻译为“alone”不太准确，结合语境推测可能是“仅此一点”之类的意思，但按照要求未做修改。
