推荐回答(3个)
PPM表示一百万份单位质量的溶液中所含溶质的质量,百万分之几就叫做几个PPM,PPM=(溶质的质量/溶液的质量)*1000000。
PPb是part per billion的缩写,系表示液体浓度的一种单位符号。一般读作1/10亿,十亿分之一,即10的负9次方的代表符号,是1/1000ppm。
PPt是10的-12次方
ppm part per million 百万分之……
ppb part per billion 10亿分之……
ppt part per trillion 万亿分之……
ppm part per million 百万分之……
ppb part per billion 10亿分之……
ppt part per trillion 万亿分之
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