

①为更好反应土壤FDA水解酶活性,建议使用新鲜土样或短期低温保存样本;
②试剂三配制后有效期较短,为便于安排实验时间,附赠一瓶试剂三作为备用,每瓶均可完成至少50个样本的测定,可根据实际情况配制;
③若A测定或∆A测定超出标准吸光值线性范围:高于最高值建议将上清液使用试剂四适当稀释或减少样本量后再进行测定;低于最低值建议适当延长反应时间或增加样本量后再进行测定,计算时相应修改;
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