standard seawater
3.Based on the level of ~(14)C in the surface water in the Bashi Channel and both side of thePhilippine Trench,this paper introduces in detail,the sampling,sample preparation and mea-surement for ~(14)C content measurement in seawater. The results indicate that ~(14)C content insurface seawater in the high-latitude waters is higher than that the modern carbon standard.

