2012 ©
Journal Publication
Title of Article The Effect of Inorganic and Organic Pre-reducing Agents on Selenium Analysis in Tomato Sample using MicrowaveAssisted Digestion Followed by FI-HGAAS 
Date of Acceptance 10 January 2015 
     Standard ISI 
     Institute of Journal ORIENTAL JOURNAL OF CHEMISTRY 
     ISBN/ISSN 0970-020X 
     Issue 31 
     Year of Publication 2015 
     Page 171-176 
     Abstract Optimum pre-reducing agents used to convert Se(VI) to Se(IV) for speciation analysis of inorganic selenium in tomato were investigated by FI-HGAAS. It was found that optimal conditions of Se(IV) consisted of 2 M HCl as carrier and 0.3%(w/v) NaBH4 in 0.2%(w/v) NaOH as reducing agent. Concerning the completely pre-reduction of Se(VI), various reducing agents were studied including KCl, KBr, KI, ascorbic acid and thiourea in association with dilute and concentrate HCl and effect of temperature. From results, two optimal pre-reducing agents:0.5%(w/v) KI/conc. HCl and 0.5%(w/v) thiourea/conc. HCl and heating for 30 min were chosen, giving a linearity between 5 and 25 ng/mL. LOD and LOQ were 0.5 and 2 ng/L, respectively. Both of pre-reducing agents were then applied to tomato digest based on dry basis of its sample, which comparatively resulted in 5.10 mg Se(IV)/kg and 29.12 mg Se(VI)/kg using 0.5%(w/v) KI/conc. HCl, and 3.84 mg Se(IV)/ kg and 22.29 mg Se(VI)/kg using 0.5%(w/v) thiourea/conc. HCl. 
     Keyword Selenium; Speciation; Pre-reduction; Tomato; FI-HGAAS. 
577020056-2 Miss NUNTICHA LIMCHOOWONG [Main Author]
Science Doctoral Degree

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Status ตีพิมพ์แล้ว 
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