摘要
以单因素试验最佳值作中心点,首先采用Plackett-Burman设计试验筛选出影响超声提取PM2.5中镉的4个显著因素:超声温度、超声时间、提取剂用量和硝酸浓度;其次采用Central Composite Design试验及响应面分析法建立二次回归模型,得到最佳超声提取条件为:HNO3浓度9%,超声时间47 min,超声温度68℃,提取剂用量18 m L。方法的相对标准偏差(RSD)为4.36%~6.73%,检出限为0.4μg/L。受人类活动影响受人类活动影响方法用于测定锦州市PM2.5中镉的含量,实验结果表明镉含量为0.84~4.02 ng/m3,虽然未超过浓度限值,但富集因子较大说明受人类活动影响镉在PM2.5中富集明显。
The optimized extraction conditions of cadmiumin PM（2.5） were obtained by a Plackett-Burman design and response surface methodology on the basis of single factor experiment. By means of the central composite design, quadratic response surface models was established. The results indicated that the optimum condition was nitric acid 9%, ultrasonic time 47 min,ultrasonic temperature 68 ℃, solvent amount 18 m L. The relative standard deviation was 4.36%~6.73%, the limit of detection was 0.4 μg/L. This method was applied to the determination of Cd in PM（2.5） at Jinzhou. The results indicated that the content of Cd is 0.84~4.02 ng/m^3. The concentration do not exceed concentration limits, but the high enrichment factors showed that Cd is enriched in PM（2.5） influenced by human action.
作者
赵刚
李旭梅
顾佳丽
董殿波
赵芳
夏云生
ZHAO Gang;LI Xumei;GU Jiali;DONG Dianbo;ZHAO Fang;XIA Yunsheng(College of Chemistry ＆ Chemical Engineering,Bohai University,Jinzhou 121013,China;Liaoning Institute of Environmental Science,Shenyang 110031,China;Huludao Municipal Environmental Protection Bureau,Huludao 125001,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第9期151-155,共5页
Environmental Science & Technology
基金
国家自然科学基金资助项目(21676028)
2016年国家级大学生创新创业训练计划项目资助(201610167078)
关键词
超声提取法
响应面分析法
PM(2.5)
镉
ultrasound assisted extraction
response surface method
PM2.5
cadmium
