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基准:ppm(百万分之一)
1 ppm = 1 mg/L(水溶液,密度≈1 kg/L)
1 ppb = 0.001 ppm = 1 μg/L
1 ppt = 0.001 ppb
1% = 10000 ppm
注:mg/L 与 ppm 仅在水溶液(密度≈1)时数值相等;其他溶液需乘以密度
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