mercury and chromium free

• 无汞无铬

mercury and chromium free的用法和样例：

例句

1. In view of the detrimental effect of mercury and chromium in determination of iron by means of dichromate titration, a new method was proposed containing no mercury and chromium.
   针对重铬酸钾法测定铁含量中汞和铬的有害影响，介绍了一种无汞无铬测定法。