用20ml氢氧化钠-EDTA作为吸收液加入到50ml比色管中，反应瓶中

用20ml氢氧化钠-EDTA作为吸收液加入到50ml比色管中，反应瓶中加入10ml抗氧化剂，以500ml/min吹气速度吹气15分钟，样品测定精密度为1.61%~4.62%，回收率为91.0%~96.8%，符合质量控制要求，节约了试剂用量，缩短了测定时间。

用20ml氢氧化钠-EDTA作为吸收液加入到50ml比色管中，反应瓶中加入10ml抗氧化剂，以500ml/min吹气速度吹气15分钟，样品测定精密度为1.61%~4.62%，回收率为91.0%~96.8%，符合质量控制要求，节约了试剂用量，缩短了测定时间。

20ml sodium hydroxide EDTA was added to 50ml colorimetric tube as absorption solution, 10ml antioxidant was added to the reaction bottle, and the sample was blown at 500ml / min for 15 minutes. The precision of sample determination was 1.61% ~ 4.62%, and the recovery was 91.0% ~ 96.8%. It met the quality control requirements, saved the reagent consumption and shortened the determination time.<br>