Photo-induced chemiluminometric determination of Karbutilate in a continuous-flow Multicommutation assembly

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Amorim, CMPG (Author) Other; Albert Garcia, JR (Author) Other; Montenegro, MCBS (Author) FFUP; Araujo, AN (Author) FFUP; Martinez M Calatayud (Author) Other

Journal

Title: Journal of Pharmaceutical and Biomedical Analysis

Vol. 43 No. 2

Pages: 421-427

ISSN: 0731-7085

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 15 Citations

ISI Web of Science

Scopus - 15 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

CORDIS: Health sciences

Other information

Authenticus ID: P-005-609

DOI: 10.1016/j.jpba.2006.07.006

Resumo (PT): The present paper deals with the chemiluminescent determination of the herbicide Karbutilate on the basis of its previous photodegradation by using a low-pressure Hg lamp as UV source in a continuous-flow Multicommutation assembly (a solenoid valves set). The pesticide solution was segmented by a solenoid valve and sequentially alternated with segments of the 0.001 mol l−1 of NaOH solution, the suitable media for the formation of photo-fragments; then it passes through the photo-reactor and was lead to the flow-cell after being divided in small segments which were sequentially alternated with the oxidizing system; 2 × 10−5 mol l−1 of potassium permanganate in 0.2% pyrophosphoric acid. The studied calibration range, from 0.1 μg l−1 to 65 mg l−1, resulted in a linear behaviour over the range 20 μg l−1–20 mg l−1 and fitting the linear equation: I = (1180 ± 30)C + (15 ± 5) with the correlation coefficient 0.9998. The limit of detection was 10 μg l−1 and the sample throughput 17 h−1. After testing the influence of a large series of potential interfering species, the method was applied to water and human urine samples. <br> <br> Keywords: Chemiluminescence; Photodegradation; Pesticides; Environmental samples; Multicommutation; Karbutilate; Continuous-flow <br> <a target="_blank" href="http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TGX-4KPP489-2&_user=2460038&_coverDate=01%2F17%2F2007&_rdoc=5&_fmt=high&_orig=browse&_srch=doc-info(%23toc%235266%232007%23999569997%23640256%23FLA%23display%23Volume)&_cdi=5266&_sort=d&_docanchor=&_ct=61&_acct=C000057398&_version=1&_urlVersion=0&_userid=2460038&md5=8b81d662dc0fb5d8d89db3eabd8d01d7"> Texto integral</a> <br> <br>

Abstract (EN): The present paper deals with the chemiluminescent determination of the herbicide Karbutilate on the basis of its previous photodegradation by using a low-pressure Ha lamp as UV source in a continuous-flow Multicommutation assembly (a solenoid valves set). The pesticide solution was segmented by a solenoid valve and sequentially alternated with segments of the 0.001 mol l(-1) of NaOH solution, the suitable media for the formation of photo-fragments; then it passes through the photo-reactor and was lead to the flow-cell after being divided in small segments which were sequentially alternated with the oxidizing system; 2 x 10(-5) mol l(-1) of potassium permanganate in 0.2% pyrophosphoric acid. The studied calibration range, from 0.1 mu g l(-1) to 65 mg l(-1), resulted in a linear behaviour over the range 20 mu g l(-1)-20 mg l(-1) and fitting the linear equation: I = (1180 +/- 30)C + (15 +/- 5) with the correlation coefficient 0.9998. The limit of detection was 10 mu g l(-1) and the sample throughput 17 h(-1). After testing the influence of a large series of potential interfering species, the method was applied to water and human urine samples.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7