A Simple Method to Determine Low Metal Concentrations in Naphtha by Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES)

IF 1.3 4区 工程技术 Q3 CHEMISTRY, ORGANIC
Ahmed Shawki Ali, Ashraf M. Ashmawy, Hazem F. Khalil, Elsayed M. Elnaggar
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引用次数: 0

Abstract

Inductively coupled plasma optical emission spectrometry (ICP-OES) was used in this study as an alternative analytical approach for measuring Al, Ca, Cu, Na, Ni, Si, Fe, P, V, and Zn in high-volatile petroleum products (naphtha) at the part per billion (ppb) sensitivity level. The distillation stage was intended for pre-concentrating metals by the matrix removal. Such multiplication of metal concentrations provided the possibility to measure them within the sensitivity range of the ICP-OES instrument. The reliability of such measurements was demonstrated for a wide concentration range of each metal, and the validation of the method was performed. Based on the standard deviations of nine successive measurements performed for 10 metals, the precision (repeatability) of the method for samples with concentrated metals was calculated. The values of this index (in ppb) were the following: 20.8 (Al), 20.4 (Ca), 13.7 (Na), 19.09 (Ni), 13.4 (Fe), 1.4 (P), 26.9 (V), and 45.15 (Zn). The reproducibility of the method was determined for nine measurements performed within several days. The results of recovery studies were excellent for the most part of the tested metals including Al (100.33%), Na (102%), and V (96.55%). The linearity test performed for calcium and silicon showed R = 0.999 for both elements. Depending on the standard deviation obtained in the linearity test, the limit of detection (LOD) range for all studied metals was determined to be between 2 and 10 ppb.

Abstract Image

Abstract Image

利用电感耦合等离子体光学发射光谱法 (ICP-OES) 测定石脑油中低金属浓度的简单方法
摘要 本研究采用电感耦合等离子体光发射光谱法 (ICP-OES) 作为替代分析方法,测量高挥发性石油产品(石脑油)中的 Al、Ca、Cu、Na、Ni、Si、Fe、P、V 和 Zn,灵敏度为十亿分之一 (ppb)。蒸馏阶段的目的是通过去除基质来预浓缩金属。金属浓度的这种倍增提供了在 ICP-OES 仪器灵敏度范围内测量金属浓度的可能性。在每种金属的较大浓度范围内,这种测量方法的可靠性得到了证明,并对该方法进行了验证。根据对 10 种金属进行的九次连续测量的标准偏差,计算出了该方法对高浓度金属样品的精确度(可重复性)。该指标值(单位 ppb)如下:20.8(Al)、20.4(Ca)、13.7(Na)、19.09(Ni)、13.4(Fe)、1.4(P)、26.9(V)和 45.15(Zn)。该方法的重现性是在几天内进行的九次测量中确定的。大部分受测金属的回收率都非常高,包括 Al(100.33%)、Na(102%)和 V(96.55%)。对钙和硅进行的线性测试表明,这两种元素的 R = 0.999。根据线性测试中获得的标准偏差,所有研究金属的检测限(LOD)范围被确定为 2 至 10 ppb。
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来源期刊
Petroleum Chemistry
Petroleum Chemistry 工程技术-工程:化工
CiteScore
2.50
自引率
21.40%
发文量
102
审稿时长
6-12 weeks
期刊介绍: Petroleum Chemistry (Neftekhimiya), founded in 1961, offers original papers on and reviews of theoretical and experimental studies concerned with current problems of petroleum chemistry and processing such as chemical composition of crude oils and natural gas liquids; petroleum refining (cracking, hydrocracking, and catalytic reforming); catalysts for petrochemical processes (hydrogenation, isomerization, oxidation, hydroformylation, etc.); activation and catalytic transformation of hydrocarbons and other components of petroleum, natural gas, and other complex organic mixtures; new petrochemicals including lubricants and additives; environmental problems; and information on scientific meetings relevant to these areas. Petroleum Chemistry publishes articles on these topics from members of the scientific community of the former Soviet Union.
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