Chiang Mai Journal of Science

Print ISSN: 0125-2526 | eISSN : 2465-3845

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Determination of Cadmium in Vegetables by Sequential Injection Analysis Method Using 8-Hydroxyquinoline as Complexing Agent

Kanokwan Chaiyasing, Boonsom Liawruangrath, Surapol Natakankitkul, Sakchai Satienperakul, Wasan Sirisungworawong, Narabhats Rannurags and Saisunee Liawruangrath*
* Author for corresponding; e-mail address: scislwrn@gmail.com
Volume: Vol.46 No.2 (March 2019)
Research Article
DOI:
Received: 10 April 2018, Revised: -, Accepted: 22 September 2018, Published: -

Citation: Chaiyasing K., Liawruangrath B., Natakankitkul S., Satienperakul S., Sirisungworawong W. and Liawruangrath N.R.A., Determination of Cadmium in Vegetables by Sequential Injection Analysis Method Using 8-Hydroxyquinoline as Complexing Agent, Chiang Mai Journal of Science, 2019; 46(2): 308-321.

Abstract

 In the present study, a novel and eco-friendly sequential injection analysis (SIA) system with spectrophotometric detection was developed for determination of Cd(II) in vegetable samples. The method is based on the reaction of 8-hydroxyquinoline with Cd(II) as a less-toxic complexing agent in H2SO4 solution, resulting in a light yellow colored complex monitored at 360 nm. The SIA parameters were optimized to obtain the best sensitivity and minimum reagent consumption. Under the optimum conditions, linear calibration graphs over the ranges of 0.04-1.0 mg L-1 and 1.5-5.0 mg L-1 were established. Due to the limitation of Beer’s law, the maximal absorption of the complex was observed at Cd(II) concentration of 1.0 mg L-1. Above which the absorbance decreased with curvature and started to be linear with low slope. The useful calibration graph for Cd(II) in vegetable sample was the first one. The limit of detection was 0.01 mg L-1, with the intra-day and inter-day precisions were less than 1.5%. The proposed method was successfully applied to the determination of Cd(II) in different vegetable samples (chinese kale, false pakchoi, cabbage, lettuce, cucumbers, coriander, water convolvulus, yard long bean, tomatoes, and potatoes) after appropriate sample pretreatment. The obtained results were in good agreement with those obtained by the ICP-MS standard method, verified by the student t-test at the 95% confidence level.

Keywords: sequential injection analysis, cadmium, 8-hydroxyquinoline, spectrophotometry, vegetables

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