测定劣质煤的发热量时，在煤样中加入标准苯甲酸，帮助样品燃烧完全。
Calorific value of poor quality coal can be determined by addition of benzoic acid as standard, which can enhance the sample to burn out.
对氟苯甲酸加标回收率为99.9%，对氟聚苯乙烯分析结果的相对标准偏差为2.7%。
The recovery per cent of the standard addition ofp-Fluorobenzoic acid for this procedure equals 99.9%, the relative standard error is 2.72%.
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