摘要
本文建立了高效液相色谱-串联质谱法(HPLC-MS/MS)来检测水中BMAA,并以次氯酸钠为消毒剂进行模拟氯化,研究BMAA的氯化降解及环境因子对BMAA降解的影响.结果表明,采用亲水交换作用色谱柱建立的HPLC-MS/MS分析方法,样品前处理过程简单易操作,在2—500μg·L^(-1)范围内线性关系良好(R2=0.9995),且检出限低(0.2μg·L^(-1)).在常规条件下(Cl∶N=2∶1,T=20℃,p H=7),BMAA能通过氯化得到有效降解,2 h降解率达到80%,6 h降解率达到97%;低的Cl∶N,低温及碱性条件下,BMAA的降解率显著降低.研究结果为饮用水预氯化及氯化消毒去除BMAA提供了理论依据.
β-N-methyl amino-L-alanine（BMAA）, a neurotoxin produced by cyanobacteria, has been detected in surface water containing algae. This study established a detection method of BMAA in water sample through High Performance Liquid Chromatography-Tandem Mass Spectrometry（HPLC-MS/MS） and investigated the degradation of BMAA by simulated chlorination using sodium hypochlorite. The results illustrated that BMAA could be detected by HPLC-MS/MS with a hydrophilic interaction liquid chromatography column. A simple pre-treatment method was also developed. A good linear relationship was obtained（R^2=0.9995） while the concentration of BMAA ranged from 2 to 500μg·L^-1, and a low detection limit（0.2μg·L^-1） was achieved. Under the general condition（Cl/N=2：1, T=20℃, pH=7）, the degradation rate of BMAA was high and was more than 80% in 2 h and about 97% in 6 h. However, compared to the general condition, the degradation rate of BMAA decreased significantly under the conditions of lower Cl/N（0.25）, lower temperature（10℃） and higher alkaline. These results could provide a basis for the removal of BMAA in the pre-chlorination and chlorination disinfection of drinking water.
出处
《环境化学》
CAS
CSCD
北大核心
2016年第2期267-272,共6页
Environmental Chemistry
基金
江苏省自然科学基金(BK20131271)
水专项课题(2013ZX07101014-06)资助~~
