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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Comparison between ordinary least squares regression and weighted least squares regression in the calibration of metals present in human milk determined by ICP-OES
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Comparison between ordinary least squares regression and weighted least squares regression in the calibration of metals present in human milk determined by ICP-OES

机译：ICP-OES测定人乳中金属含量时，普通最小二乘回归法和加权最小二乘回归法的比较

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摘要

In this study we compared the use of ordinary least squares and weighted least squares in the calibration of the method for analyzing essential and toxic metals present in human milk by ICP-CES, in order to avoid systematic errors in the measurements used. Human milk samples were provided by maternity clinic Odete Valaclares and digested by means of a high-performance microwave (MW) oven. Evaluation of plasma short and long-term stability was made using a solution of digested milk (1:50) with 2.0 mg L-1 Mg in HNO3 2% (v/v). The detection power resulted to be at or below the mu g L-1 level, whilst the precision expressed as relative standard deviation R.S.D. was almost always equal to or better than 3.3%. Certified reference material Infant Formula (NIST SRM 1846) was used to assess the accuracy of the proposed method, which proved to be accurate and precise. Recovery rates were in the range of 83-117%. Aqueous calibration was carried out for each element under study.
机译：在这项研究中，我们比较了在通过ICP-CES分析人乳中存在的必需和有毒金属的方法的校准中使用普通最小二乘法和加权最小二乘，以避免使用的测量出现系统误差。母乳样品由产科诊所Odete Valaclares提供，并通过高性能微波炉（MW）进行消化。使用含2.0 mg L-1 Mg的2％HNO3（v / v）的消化牛奶（1:50）溶液评估血浆短期和长期稳定性。结果检测力达到或低于μg L-1水平，而精度表示为相对标准偏差R.S.D。几乎总是等于或高于3.3％。使用认证的参考材料婴儿配方奶粉（NIST SRM 1846）来评估所提出方法的准确性，事实证明该方法准确无误。回收率在83-117％之间。对所研究的每个元素进行水校准。

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