In 2000,the Carbon Dioxide in the Ocean working group of the North Pacific Marine Science Organization(PICES)performed an international experiment on the intercalibration of the measurements of the total alkalinity in seawater using certified reference materials(CRM).Taking part in this experiment,Russian specialists presented the method by Bruevich.The results of the intercalibration showed that the alkalinity values obtained by Bruevich's method using modern burettes,an Na2CO3 reactant of high purity as a standard to ascertain the acid titre,and corrections for the acid density and for the weights of the acid and seawater samples in vacuum are in agreement with the standard within+-1 mu M/kg.
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