title: Determination of picogram quantities of chlortoluron in soil samples by luminol-chitosan chemiluminescence system.
abstract: Based on the enhancing effect of chitosan (CS) on luminol-dissolved oxygen chemiluminescence (CL) reaction, a flow injection (FI) luminol-CS CL system was established. It was found that the increase of CL intensity was proportional to the concentrations of CS ranging from 0.7 to 10.0 μmol l(-1). In the presence of chlortoluron (CTU), the CL intensity of luminol-CS system could be obviously inhibited and the decrements of CL intensity were linearly proportional to the logarithm of CTU concentrations ranging from 0.01 to 70.0 ng ml(-1), giving the limit of detection 3.0 pg ml(-1) (3σ). At a flow rate of 2.0 ml min(-1), the whole process including sampling and washing could be accomplished within 36 s, offering a sample throughput of 100 h(-1). The proposed FI-CL method was successfully applied to the determination of CTU in soil samples with recoveries ranging from 95.0 % to 105.3 % and the relative standard deviations (RSDs) of less than 4.0 %.
authors.affiliation: Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, College of Chemistry and Materials Science, Northwest University, 710069, Xi'an, China.
authors.forename: Yajuan
authors.initials: Y
authors.lastname: Li
authors.forename: Jingjing
authors.initials: J
authors.lastname: Zhang
authors.forename: Xunyu
authors.initials: X
authors.lastname: Xiong
authors.forename: Kai
authors.initials: K
authors.lastname: Luo
authors.forename: Jie
authors.initials: J
authors.lastname: Guo
authors.forename: Minxia
authors.initials: M
authors.lastname: Shen
authors.forename: Jiajia
authors.initials: J
authors.lastname: Wang
authors.forename: Zhenghua
authors.initials: Z
authors.lastname: Song
mesh_terms: D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods*; D008165:Luminol / Q000737:chemistry*; D010671:Phenylurea Compounds / Q000032:analysis*; D015203:Reproducibility of Results; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D010671:Phenylurea Compounds; D012989:Soil Pollutants; D008165:Luminol; D048271:Chitosan; C007033:chlortoluron