![]() ![]() Precision values ranged from 6 to 13% and recoveries from 89 to 106%. The LOD and LOQ were 2 and 5 μg mL −1, respectively, and a linear correlation ( R 2 = 0.9927) was obtained with concentrations ranging from 5 to 250 μg mL −1. Limit of detection (LOD), limit of quantification (LOQ), linearity, precision, and recovery were determined by analyzing decanoic acid in seawater samples. Modified and unmodified wooden toothpicks were compared, and the intensities of all NAs were higher when using the modified substrates than when using the unmodified ones. The extraction conditions were optimized by analyzing NAs (benzoic acid, 1-naphthoic acid, decanoic acid, 3,5-dimethyladamantane-1-carboxylic acid, and 3,5-dimethyladamantane-1-acetic acid) in pure water, and the best condition was using 5 min of extraction time with the samples under agitation. An NH 2-modified toothpick was inserted into the analyte extraction sample and was subsequently used as an electrospray emitter for MS analysis. NH 2 was introduced into the cellulosic material through a silanization reaction using aminopropyltriethoxysilane. ![]() This work describes the surface coating of wooden toothpicks with amino groups (NH 2) for electrospray ionization mass spectrometry (MS) analysis of naphthenic acids (NAs) in produced water samples and crude oil fractions. ![]()
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