共查询到16条相似文献,搜索用时 484 毫秒
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吹扫捕集-气相色谱/质谱法测定土壤中挥发性有机化合物 总被引:10,自引:3,他引:7
建立了吹扫捕集-气相色谱/质谱技术测定土壤中挥发性有机化合物的方法,对标准模拟样品的基体选择、吹扫捕集条件、色谱条件等实验条件进行了考察。结果表明,方法检出限为0.20~0.60μg/kg,精密度(RSD,n=7)为2.78%~9.89%,基体加标平均回收率为81.5%~115.2%。方法准确可靠,用于批量样品的实际分析,检测结果良好。 相似文献
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吹扫捕集浓缩仪-气相-质谱联用仪P&TGC—MSTRACEDSQ是西安地质调查中心实验测试中心于2006年引进的。吹扫捕集浓缩仪作为一种前处理设备,主要处理那些需要由气相色谱(GC)或气相色谱/质谱(GC/MS)进行挥发性有机物质(VOC)分析的样品。其工作原理为: 相似文献
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应用吹扫捕集-气相色谱-质谱法测定岩溶地区垃圾渗透液中36种挥发性有机物(VOCs)的含量。获取样品溶液5 mL于吹扫瓶中,利用TELEDYNE TEKMAR型吹扫捕集直接进样,经DB-VRX毛细管色谱柱分离、电子轰击电离(EI)全扫描检测,选择特征离子,再用外标法进行定量测定。结果表明:36种挥发性有机物的质量浓度在1~100 μg·L-1 范围内,与其峰面积呈线性关系,方法检出限在0.03~0.27 μg·L-1 之间,加标回收率在88%~110%之间,相对标准偏差(n=7)在2.32%~6.51%之间。 相似文献
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苯系污染物(苯、甲苯、乙苯和二甲苯)是环境中重点优先监测的致癌污染物。文章介绍了近年来国内外在水环境中苯系污染物的分析研究进展,内容主要包括:胶束电动毛细管色谱法(MECC)、吹扫捕集-气相色谱法(PT-GC)、吹扫捕集-气相色谱-质谱联用法(PT-GC-MS)、顶空固相微萃取(HS-SPME)-便携式微火焰离子化(portable GC-μFID)等联测分析技术与方法。 相似文献
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吹扫捕集-气相色谱法测定水中七种氯苯类化合物 总被引:4,自引:1,他引:4
试验了三种色谱柱的分离效果,选用自制的环糊精毛细管柱,用吹扫捕集气相色谱法对水体中七种氯苯类化合物进行分析,优化了吹扫捕集的主要工作条件。方法的线性范围为1~100nL/L,重现性良好,6次重复测定的RSD为3.62%~6.98%。进样量5mL时,其检出限可达0.5nL/L,较之液液萃取灵敏度提高了至少50倍。 相似文献
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建立了吹扫捕集—气相色谱质谱法测定重点行业企业用地地下水中60种挥发性有机物的分析方法.采用屈臣氏双蒸水作为空白水,选择离子与全扫描模式交替方式进行定性定量,确定了保护剂的种类和用量,优化了吹扫捕集条件.方法检出限范围在0.3~1.2μg/L.该方法的线性范围为0~250μg/L,相关系数R2在0.9907~0.9999之间,3种不同浓度的加标平均回收率为87.2%~117%,相对标准偏差在1.7%~9.7%之间,优于《重点行业企业用地调查质量保证与质量控制技术规定(试行)》对地下水挥发性有机物的质控要求.本方法增加了VOCs的测试种类,线性范围宽,灵敏度高,适合于各类重点行业企业用地地下水中60种挥发性有机物的快速批量分析. 相似文献
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A sample preparation technique was developed to isolate and separate two classes of combustion-produced pollutants: three- to six-ring polycyclic aromatic hydrocarbons (PAH) and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F), from sediment samples for interference-free analyses by gas chromatography/mass spectrometry (GC/MS). The method involves soxhlet extraction with methylene chloride, sulfur removal with activated copper powder, gel filtration chromatography with Sephadex LH-20, polarity separations of PAH and PCDD/F with prepacked silica gel solid-phase extraction columns, and isolation of PCDD/F from polychlorinated biphenyls with microalumina columns. Stringent procedural controls were established to achieve clean isolations and recoveries of 70% or better for each step in the method. The prepared sample extracts were analyzed by capillary GC and GC/MS. Electron impact ionization was used for PAH, and negative chemical ionization with methane as a reagent gas was used for PCDD/F. Reproducible results were obtained. The method is simple and has the advantage of conserving sample consumption since two classes of compounds can be analyzed from the same sample. This can be critical in sediment core analyses where sample size is usually limited. 相似文献
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A. A. Tomilenko T. A. Bul’bak L. N. Pokhilenko D. V. Kuzmin N. V. Sobolev 《Doklady Earth Sciences》2016,469(1):690-694
The composition of volatile components in picroilmenites from Yakutian kimberlitic pipes of various ages (the Olivinovaya, Malokuonapskaya, and Udachnaya–East pipes) was studied for the first time by means of gas chromatography–mass spectrometry (GC-MS). It was shown that picroilmenites and olivines from same kimberlitic pipes contained volatile components of close composition, whereas these components were quite different in these minerals from different pipes. These features point to a common source and represent the specificity of the magma chamber formed under the pronounced influence of hydrocarbons with their derivates, as well as nitrogen-, chlorine-, and sulfur-containing compounds. The fraction of hydrocarbons and derivates in the composition of volatile matter is as high as 99%, including 9.7% of chlorine- and fluorinecontaining compounds. 相似文献
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The aliphatic fraction of the bitumens from 3 bands of the Puertollano oil shale field have been studied by gas chromatography and gas chromatography/mass spectrometry. Previous work published over the last years reached different conclusions about the origin of the organic matter in the Puertollano oil shales. A reappraisal of some of the biomarkers was then needed for a better understanding of the aliphatic hydrocarbons assemblage. The identified compounds, mainly n-alkanes in the medium to high boiling point region, acyclic isoprenoids and hopane-related compounds point towards a predominant algal/bacterial input. No unequivocally higher plant derived biomarkers have been detected in significant amounts, suggesting that the bulk of the organic matter derive from authocthonous organisms living in the basin. The biomarker maturity ratios indicate that the 3 Puertollano oil shales have similar maturities and are close to the onset of oil generation, assessing a slightly higher maturity than that determined by petrographic techniques. 相似文献