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1·Objective To detect the DNA strand breaks induced by adriamycin, potassium chromate or hydrogen peroxide and to study the effect ofp tyrosol on DNA oxidative damage in CHL cells.

目的检测阿霉素、重铬酸钾和过氧化氢所致中国仓鼠肺成纤维细胞（CHL）DNA的损伤效应及酪醇对真核细胞DNA氧化损伤的保护作用。

2·The excess tin chloride addition produces black mercury precipitation and is about to seriously affect the determination of iron by using potassium chromate volumetric analysis method.

重铬酸钾容量法测铁中，二氯化锡超量产生黑色汞沉淀，严重影响测定。