In this study, dispersive liquid-liquid microextraction (DLLME) and slotted quartz tube (SQT) were coupled to flame atomic absorption spectrometry (FAAS) to increase the sensitivity of lead. Conditions such as the formation of the lead-dithizone complex, efficiency of the DLLME method and the output of the SQT were systematically optimized to improve the detection limit for the analyte. The conventional FAAS system was improved upon by about 3.0 times with SQT-FAAS, 32 times with DLLME-FAAS and 142 times with DLLME-SQT-FAAS. The method was applicable over a wide linear range (10–500 μg L⁻¹). The limit of detection (LOD) determined by DLLME-SQT-FAAS for seawater and mussel were 2.7 μg L⁻¹ and 270 μg kg⁻¹, respectively. The percent recoveries obtained for mussel and seawater samples (spiked at 20 and 50 μg L⁻¹) were 95–96% and 98–110%, respectively.

中文翻译：

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旋涡辅助分散液液微萃取狭缝石英管火焰原子吸收光谱法测定贻贝和海水中痕量铅

在这项研究中，将分散液-液微萃取（DLLME）和开缝石英管（SQT）与火焰原子吸收光谱法（FAAS）耦合以提高铅的灵敏度。系统地优化了诸如铅-二硫zone配合物的形成，DLLME方法的效率和SQT的输出等条件，以提高分析物的检出限。使用SQT-FAAS改进了传统的FAAS系统约3.0倍，使用DLLME-FAAS改进了32倍，使用DLLME-SQT-FAAS改进了142倍。该方法适用于较宽的线性范围（10–500μgL ^-1）。DLLME-SQT-FAAS测定的海水和贻贝的检出限（LOD）为2.7μgL ^-1和270μgkg ^-1， 分别。贻贝和海水样品（以20和50μgL ^-1加标）的回收率分别为95-96％和98-110％。