摘要
本文建立了吹扫捕集-气相色谱-质谱联用法同时测定水中2-甲基异冰片、土臭素、2,4,6-三氯苯甲醚、β-环柠檬醛、2-异丙基-3-甲氧基吡嗪、2-异丁基-3-甲氧基吡嗪、β-紫罗兰酮和二甲基三硫醚等8种典型嗅味物质的方法,为预警嗅味水质突发事件和开展相关研究奠定基础.对8种典型嗅味物质的样品吹扫条件,如:捕集管的型号、吹扫温度、吹扫时间、解析时间及盐效应等进行优化.本实验测定嗅味物质的最佳条件为:样品中加入Na Cl的质量浓度为12%(m/V)、样品吹扫温度40℃、吹扫时间20 min、解析时间2 min和解析温度250℃等.通过基质加标实验验证方法的准确度与精密度,8种嗅味物质在1—50μg·L^(-1)浓度范围内线性良好,相关系数>0.999,方法检出限(LOD)(S/N=3)在0.4—1.7 ng·L^(-1).在高、低加标浓度水平下,8种典型嗅味物质回收率范围是85.2%—118%,相对标准偏差为1.03%—4.53%.本方法具有较好的准确性、稳定性和实用性,可用于环境水体中嗅味物质的分析.
A fast,sensitive and solvent-free method for the determination of eight trace taste and odor compounds, including dimethyltrisulfide, β-cyclocitral, 2,4,6-trichloroanisole, geosmin2-isopropyl-3-methoxypyrazine,2-isobutyl-3-methoxypyrazine,2-methylisoborneol and β-ionone in water samples was developed utilizing automatic purge and trap（ PT） coupled with gas chromatography-mass spectrometry（ GC-MS）. Parameters such as the type of traps,purge time,purge temperature,desorption time and ionic strength were optimized. Taste and odor compounds（ TO） were purged from 40 m L water sample containing sodium chloride（ m/V = 12%） at 40 ℃for 20 min and desorbed 2 min at 250 ℃. The calibration curve of these eight TO showed good linearity in the range of 1—50 μg·L^-1with a correlation coefficient above 0. 999. The limits of detection（ LOD）（ S / N = 3） were all below 1. 7 ng·L^-1. The technique was applied to spiked water samples,and acceptable recoveries were achieved. The recoveries of the analytes from water samples were between 85. 2% and 118%,and the relative standard deviations（ RSD） were between 1. 03%and 4. 53%（ n = 7）. This method could be employed for monitoring the eight odors in natural waters with good accuracy,stability and practicability.
出处
《环境化学》
CAS
CSCD
北大核心
2016年第10期2127-2133,共7页
Environmental Chemistry
基金
国家自然科学基金(41201527)资助~~
关键词
嗅味物质
吹扫捕集
气相色谱
质谱
水体
taste and odor compounds
purge-and-trap
gas chromatography
mass spectrometry
water
