it will accomplish the hydride generation at micro-liter sample volume without the need for an external addition of acid, and the use of a gas-liquid separator 给出了装置的结构、操作,试验并优化了固体还原剂与有机酸的质量配比、反应腔体体积、进样量等反应条件。
based on the sampling error in the normal random sampling and layered sampling, the methods of determining sample volume and selecting of sampling themes are studied 对于一般随机抽样与分层抽样根据给定的抽样误差确定抽样量,探讨样本容量的计算方法和选择抽样检验方案的方法。