Abstract In this work, the determination of ytterbium in road dust samples, employing a simple and fast methodology, based on sample preparation as slurry and analysis by high resolution-continuum source graphite furnace atomic absorption spectrometry (HR-CS-GFAAS), is purposed. The determinations were carried out on the Yb main line, 398.799 nm, using an integration time of 5.0 s. The optimum condition for the slurry preparation of road dust samples was established through a Doehlert matrix for two variables, which employed a HNO3 concentration of 0.24 mol L−1 and homogenization time of 34 min, using ultrasonic bath. The temperatures applied to the graphite furnace were optimized, wherein the pyrolysis and atomization temperatures were 1200 °C and 2700 °C, respectively, using 250 μg of W as permanent chemical modifier. To investigate possible matrix interferences in the determination of Yb in road dust samples, external calibration and standard addition curves were compared. The comparison between slopes of the external and standard addition calibration curves showed difference of about 7.0%, an indication of absence of matrix effects for determination of Yb in road dust samples. The limit of detection (LOD) and limit of quantification (LOQ) were 22 and 72 ng g−1, respectively, with a characteristic mass of 6.0 pg. The accuracy was confirmed through analyses of three certified reference materials (CRM): Trace Elements in Soil Containing Lead From Paint (NIST 2586), Rock (NCS DC 73301) and Geochemical Soil (TILL-1), and the good agreement between the found and certified values was obtained, 99 ± 4 to 104 ± 2%, corroborating the accuracy of the analytical method. The precision was expressed as relative standard deviation (RSD) for measurements in triplicate, being lower than or equal to 10.0%. The analytical method was used for Yb determination in eight samples of dust collected in an urban area of Salvador and Jaguaquara, Bahia State, Northeast, Brazil. The concentrations obtained for Yb ranged from 172 ± 13 to 2065 ± 122 ng g−1. Thus, the proposed analytical method presents the characteristics of being fast, precise and accurate for the determination of Yb in road dust samples, employing slurry sampling and detection by HR-CS-GFAAS.

中文翻译：

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高分辨连续源石墨炉原子吸收光谱法浆液取样检测道路粉尘中镱的定量

摘要 在这项工作中，基于样品制备为浆液和高分辨率-连续源石墨炉原子吸收光谱法 (HR-CS-GFAAS) 分析，采用一种简单快速的方法测定道路粉尘样品中的镱。 . 测定在 Yb 主线 398.799 nm 上进行，积分时间为 5.0 s。通过 Doehlert 矩阵为两个变量建立了道路灰尘样品浆料制备的最佳条件，其中 HNO3 浓度为 0.24 mol L-1，均质时间为 34 分钟，使用超声波浴。应用到石墨炉的温度进行了优化，其中热解和雾化温度分别为 1200 °C 和 2700 °C，使用 250 μg W 作为永久化学改性剂。为了研究测定道路灰尘样品中 Yb 时可能存在的基质干扰，比较了外部校准曲线和标准添加曲线。外部和标准添加校准曲线的斜率之间的比较显示约 7.0% 的差异，表明在测定道路灰尘样品中 Yb 时不存在基质效应。检测限 (LOD) 和定量限 (LOQ) 分别为 22 和 72 ng g-1，特征质量为 6.0 pg。通过对三种有证标准物质 (CRM) 的分析证实了准确性：油漆中含铅的土壤 (NIST 2586)、岩石 (NCS DC 73301) 和地球化学土壤 (TILL-1) 中的痕量元素，以及发现的结果之间的良好一致性并获得了 99 ± 4 至 104 ± 2% 的认证值，证实了分析方法的准确性。精密度表示为一式三份测量的相对标准偏差 (RSD)，低于或等于 10.0%。该分析方法用于测定巴西东北部巴伊亚州萨尔瓦多和 Jaguaquara 市区收集的八个粉尘样品中的 Yb。获得的 Yb 浓度范围为 172 ± 13 至 2065 ± 122 ng g-1。因此，所提出的分析方法采用泥浆采样和HR-CS-GFAAS检测，具有快速、准确和准确测定道路灰尘样品中Yb的特点。巴西东北部。获得的 Yb 浓度范围为 172 ± 13 至 2065 ± 122 ng g-1。因此，所提出的分析方法采用泥浆采样和HR-CS-GFAAS检测，具有快速、准确和准确测定道路灰尘样品中Yb的特点。巴西东北部。获得的 Yb 浓度范围为 172 ± 13 至 2065 ± 122 ng g-1。因此，所提出的分析方法采用泥浆采样和HR-CS-GFAAS检测，具有快速、准确和准确测定道路灰尘样品中Yb的特点。