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GB/T 4945-2002 English PDF (GBT4945-2002)

GB/T 4945-2002 English PDF (GBT4945-2002)

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GB/T 4945-2002: Standard test method for acid and base number of petroleum products and lubricants by colour-indicator titration
This Standard is applicable to the determination of acid or basic constituents in petroleum products and lubricants soluble or nearly-soluble in mixtures of toluene and isopropyl alcohol. It is applicable for the determination of acids or bases whose dissociation constants in water are larger than 10(9); extremely weak acids or bases whose dissociation constants are smaller than 10(9). If their hydrolysis constants are larger than 10(9), then there is influence.

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