电感耦合等离子体发射光谱法测定网络销售豆制品零食中的硼酸

Determination of boric acid in online selling bean products snacks by inductively coupled plasma-optical emission spectrometry

中文关键词:  硼酸  电感耦合等离子体发射光谱法  豆制品零食

英文关键词:boric acid  inductively coupled plasma-optical emission spectrometry  bean products snacks

中文摘要:

      目的 建立电感耦合等离子体发射光谱法(inductively coupled plasma-optical emission spectrometry, ICP-OES)测定网络销售豆制品零食中硼酸含量的方法。方法 以2.00%硫酸水溶液为提取剂, 10%三氯乙酸为沉淀剂, 超声提取样品中硼酸, 外标法定量。结果 硼在249.678 nm波长下, 0.01~1.00 mg/L范围内与信号强度呈良好线性关系, 相关系数为0.99967, 检出限(以硼酸计)为0.006 mg/kg, 定量限为0.018 mg/kg。豆制品零食样品中3水平的加标回收率为95.74%~106.23%, 相对标准偏差(relative standard deviations, RSDs)为0.16%~1.81%。采用本研究建立的方法对140批次的网络销售豆制品零食中硼酸的含量进行检测, 含量范围为2.22~167.79 mg/kg, 且82.14%的网络销售豆制品零食中的硼酸含量小于50 mg/kg。结论 该方法前处理简单、检测速度快, 可用于豆制品零食类样品中硼酸的检测。

英文摘要:

      Objective To establish a method for determining boric acid content in online selling bean products snacks by inductively coupled plasma-optical emission spectrometry (ICP-OES). Methods Boric acid in the sample was extracted by ultrasound with 2.00% sulfuric acid aqueous solution as the extracting agent and 10% trichloroacetic acid as the precipitating agent, and quantified by external standard method. Results A good linear relationship was established between 0.01?1.00 mg/L and signal strength at 249.678 nm, with the correlation coefficient of 0.99967, the limit of detection (calculated based on boric acid) was 0.006 mg/kg, limit of quantitation was 0.018 mg/kg. The recoveries at 3 spiked levels were 95.74%?106.23% and the relative standard deviations (RSDs) were 0.16%?1.81%. The method established in this study was used to detect the content of boric acid in 140 batches of online selling bean products snacks, the content range were 2.22?167.79 mg/kg, and 82.14% of the online selling bean products snacks had boric acid content less than 50 mg/kg. Conclusion This method is simple in pretreatment and rapid in detection, and can be used for the detection of boric acid in bean products and snacks.