500 and 50 ppb were prepared using 0.2% HCl中的“0.2% ”代表什么
Lower working concentrations of 500 and 50 ppb were prepared using 0.2% HCl.
中的 0.2% 代表什么??
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Lower working concentrations of 500 and 50 ppb were prepared using 0.2% HCl.
中的 0.2% 代表什么??
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0.2% 代表HCl质量百分数
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0.2% HCl因该是盐酸浓度(v/v),具体你看看上下文,