考虑到酸性化合物和碱性化合物之间可能的相互作用，进行回收率实验时三个标准品被分别加入样品溶液中，并且将体积扩大了一倍。
Considering interaction between acidic and alkaline compounds, three standard markers were added respectively and the volume of sample solution was doubled in recovery experiments.
结果表明，空气的换向时间、蜂窝陶瓷蓄热体换热器的体积等是影响其温度效率和热回收率的重要因素。
The results show that: the switch time of air and the bulk of storage bed play important roles as regards its thermal performance characteristics.
采用该公式，加标体积可以不受严格控制，其计算结果与真实的回收率一致，适用于日常水质分析工作。
The results show that the recovery rates from the two improved formulas are in accordance with the true recovery rates and the methods are suitable for routine water quality analysis.
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