TB Chokwe, et al. “Improved Derivatization Protocol for Simultaneous Determination of Alkylphenol Ethoxylates and Brominated Flame Retardants Followed by Gas chromatography–mass Spectrometry Analyses”. Water SA, vol. 41, no. 2 WISA 2014 Special Edition, Mar. 2015, https://doi.org/10.4314/wsa.v41i2.03.