A chemometric-assisted method for the simultaneous determination of malachite green and crystal violet in water based on absorbance-pH data generated by a homemade pH gradient apparatus

作者：Yu Shuling^*; Yuan Xuejie; Yang Jing; Yuan Jintao; Shi Jiahua; Wang Yali; Chen Yuewen; Gao Shufang

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2015, 150: 403-408.

DOI：10.1016/j.saa.2015.05.060

• Malachite green
• Crystal violet
• Second-order data
• pH gradient
• Multidimensional partial least-squares with residual bilinearization

An attractive method of generating second-order data was developed by a dropping technique to generate pH gradient simultaneously coupled with diode-array spectrophotometer scanning. A homemade apparatus designed for the pH gradient. The method and the homemade apparatus were used to simultaneously determine malachite green (MG) and crystal violet (CV) in water samples. The absorbance-pH second-order data of MG or CV were obtained from the spectra of MG or CV in a series of pH values of HCl-KCl solution. The second-order data of mixtures containing MG and CV that coexisted with interferents were analyzed using multidimensional partial leak-squares with residual bilinearization. The method and homemade apparatus were used to simultaneously determine MG and CV in fish farming water samples and in river ones with satisfactory results. The presented method and the homemade apparatus could serve as an alternative tool to handle some analysis problems.

• 出版日期2015-11-5
• 单位河南大学; 郑州大学