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在处理来稿中,我们常遇到有些作者把ppm缩写作为单位符号使用。例如,把磷化氢浓度写成0.3ppm,这是不对的。新版GB3101—93“有关量,单位和符号的一般原则”中规定,不能使用ppm这类缩写。因为它是在一部分国家用来表示数量份额的一种缩写,ppm代表10~(-6)。如果不加说明地使用,容易引起歧义和混乱。即使写出了多少ppm,其含义仍是模糊的,并不能知道它表示的是质量分数还是体积分数,于是还必须在其后附加m/m或“v/v等,而这又是国家标准规定中所不允许的。
In dealing with manuscripts, we often encounter that some authors use ppm abbreviations as unit symbols. For example, writing the phosphine concentration to 0.3 ppm is not correct. The new version of GB3101-93 “general principles of volume, units and symbols,” provides that you can not use abbreviations such as ppm. Because it is an acronym used in some countries to denote quantity shares, ppm stands for 10 ~ (-6). If used indefinitely, easily lead to ambiguity and confusion. Even if the number of ppm is written, its meaning is still vague, and it can not know whether it represents the mass fraction or the volume fraction. Therefore, it must be followed by m / m or “v / v” Not allowed in the rules.