1. The tetraphenylboron sodium gravimetric method must be employed when K2O is higher in compound fertilizer for enough accuracy.
   当复混肥中K2O含量较高时,仍宜用四苯硼钾重量法测定钾含量。
2. METHODS Sodium tetraphenylboron gravimetric analysis was replaced by highly-accurate nephelometric titrimetry to determine potassium chloride in Compound sodium chloride injection.
   方法用高精度散射光度滴定法代替四苯硼钠重量法。

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