超声酸提取-电感耦合等离子体发射光谱(ICP-OES)法测定复配矿物质中铁锌

Determination of Fe and Zn in Compound Minerals by Inductively Coupled Plasma Optical Emission Spectrometer(ICP-OES)with Ultrasonic Acid Extraction

为了准确定量复配矿物质中营养元素,建立了复配矿物质中铁、锌的超声酸提取-电感耦合等离子体发射光谱(ICP-OES)法快速测定方法。以硝酸(10%)为前处理试剂,利用超声辅助提取,优化了仪器检测的条件,消除干扰,并进行方法检出限、精密度和方法准确性等实验。铁、锌检出限分别为1 mg/kg和0.5 mg/kg,线性范围为0.0~5.0 mg/L,线性相关系数(r)优于0.999。相对标准偏差(RSD)均在5.0%以下,加标回收率在91.4%~108%,实物加标回收与加标值一致。实验结果表明,方法灵敏度高、简便、快速、准确,适用于复配矿物质中铁、锌的测定。

The objective of this study is to overcome that the microwave digestion method is not suitable for the pretreatment of nutrient elements in complex minerals.A method for the rapid determination of iron and zinc in meal compound minerals by ultrasonic acid extraction using ICP-OES was developed.10%nitric acid was used as pretreatment reagent,and the ultrasonic assisted extraction was applied for the extraction of analyte.The experimental conditions were optimized,the interference was eliminated.Some experiments including detection limit,precision and accuracy was performed.The detection limit of iron and zinc was 1 mg/kg and 0.5 mg/kg,while the linear range was 0—5.0 mg/L and the linear coefficient(r)is better than 0.999.The precision of the method(RSD)was less than 5.0%.The determined contents were in good agreement with the certified values.The recoveries of real samples are from 91.4%to 108%.The experiments showed that this method was sensitive,simple,rapid,and accurate for the determination of iron and zinc contents in meal compound minerals.