A rapid and low-cost colorimetric method for detection of quaternary ammonium surfactants using citrate-stabilized AuNPs based on the hydrophobic effect was developed. The LODs of different surfactants ranged from 0.5 μM to 5 μM.
L. Zheng, X. Yu, J. Xu and H. Chen, Anal. Methods, 2014, 6, 2031 DOI: 10.1039/C3AY42287A
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