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1.
气相色谱/质谱法测定环境毒饵中溴敌隆   总被引:1,自引:0,他引:1       下载免费PDF全文
采用气相色谱/质谱联用法测定环境毒饵中溴敌隆,优化了试验条件。方法在0mg/L~10.0mg/L范围内线性良好,检出限为0.01mg/kg,标准溶液测定的相对标准偏差为2.2%~4.6%,样品加标回收率为92.5%-96.3%。  相似文献   

2.
建立了固相萃取-高效液相色谱测定水产品中四环素类抗生素残留的方法,优化了前处理方法和色谱条件。方法在0mg/L-1.0mg/L范围内线性良好,四环素、土霉素和金霉素的检出限分别为0.02mg/kg、0.01mg/kg和0.05mg/kg,样品测定的RSD分别为6.8%、7.2%和8.5%,加标回收率分别为55.2%-81.0%、60.5%-70.5%和52.5%~73.5%。  相似文献   

3.
用二氯甲烷提取稻田水和水稻植株样品中的丙草胺,稻田土壤样品用二氯甲烷-甲醇混合溶剂(体积比为9∶1)提取,再用高效液相色谱仪测定。方法在0.02 mg/L~2.00 mg/L的范围内线性良好,相关系数为0.9998;稻田水、土壤,水稻植株中丙草胺的检出限分别为0.001 mg/L、0.005 mg/kg、0.01 mg/kg;对稻田水、土壤和水稻植株分别做3个浓度水平的加标回收试验,重复5次,平均回收率在75.5%~84.7%之间,测定结果的相对标准偏差为2.0%~10.5%。  相似文献   

4.
采用程序控温石墨全自动消解仪消解土壤样品,原子荧光光谱法测定总砷。通过试验确定原子荧光光度计的最佳工作条件,使得该方法在2.00μg/L ~20.0μg/L 范围内线性良好,检出限为0.025 mg/kg,加标回收率在96.0%~10^5%之间,RSD为1.9%~3.3%。用该方法与国标法同时测定土壤标准样品和实际样品,结果无显著差异。  相似文献   

5.
通过对镇江地区土壤样品中 Cd 监测结果统计分析表明,全市69个样品中 Cd 质量比范围为0.06 mg/kg ~1.37 mg/kg,均值为0.23 mg/kg,与全国背景值相比,有一定程度富集;样品中 Cd 质量比成偏态分布,相对标准偏差较大。选用单项污染指数法对 Cd污染程度评价表明,镇江地区83%的土壤样品未受到 Cd 污染,14%为轻度污染,3%为中度污染。结合镇江地区的产业结构分析,电镀行业是土壤 Cd 污染的主要来源,道路运输、农药化肥在一定程度上也加重了污染。  相似文献   

6.
采用离子色谱法测定废气中的丙烯酸,几种常见的无机阴离子对分析无干扰。方法在0.100mg/L~10.0mg/L范围内线性良好,对有组织废气和无组织废气的检出限分别为0.04mg/m3和0.003mg/m3,废气平行样品测定值的相对偏差为3.4%~10.5%,加标样品的回收率为91%~102%。  相似文献   

7.
微波消解-氢化物发生原子荧光法测定植物中汞和砷   总被引:2,自引:0,他引:2       下载免费PDF全文
采用微波消解-氢化物发生原子荧光法测定植物中汞和砷,优化了试验条件。汞在0μg/L-1.00μg/L、砷在0μg/L~20.0μg/L范围内线性良好,方法检出限汞为0.005mg/kg(以取0.1g样品消解定容至10mL计),砷为0.010mg/kg(以取0.1g样品消解定容至25mL计),植物样品测定的RSD≤4.5%,加标回收率为90.0%~107%。  相似文献   

8.
建立了水中钼的硫氰酸盐一抗坏血酸体系流动注射分光光度测定法,优化了试验条件。方法在0mg/L~16mg/L范围内线性关系良好,检出限为0.19mg/L,废水样品测定的RSD≤I.6%,加标回收率为96.3%~104%,与国家标准方法的测定结果一致。  相似文献   

9.
高效液相色谱法测定稻米和稻田水土中多菌灵残留   总被引:1,自引:0,他引:1  
采用高效液相色谱法测定稻米和稻田水土中的多菌灵残留,用稀盐酸溶液提取,经液液分配净化,外标法定量。多菌灵的峰面积与进样质量在0.15ng-220ng范围内呈线性相关,在稻田水、土壤和稻米中的最低检出质量比分别为0.01mg/kg、0.01mg/kg和0.02mg/kg。3个质量水平的加标回收试验结果表明,多菌灵在稻田水样中的平均回收率为87.1%~93.0%,RSD为3.3%~3.8%;在土壤中的平均回收率为84.8%-91.9%,RSD为1.4%~4.1%;在稻米中的平均回收率为83.9%~89.6%,RSD为1.8%-5.5%。  相似文献   

10.
采用离子色谱法同时测定污泥与餐厨垃圾联合厌氧发酵液中乳酸、乙酸、丙酸、正丁酸、异丁酸、正戊酸、异戊酸等7种有机酸,通过试验优化洗脱程序,使得7种有机酸在2.00mg/L~60.0mg/L范围内线性良好。试验表明,方法检出限为0.250mg/L~0.580mg/L,标准样品的加标回收率为93.O%~108%,8次测定结果的RSD为3.7%一7.1%,实际样品测定的加标回收率为90.6%~109%。  相似文献   

11.
采用高效液相色谱法测定鸡蛋清和蛋黄中磺胺嘧啶、磺胺吡啶、磺胺二甲基嘧啶、磺胺甲氧哒嗪、磺胺甲恶唑、磺胺间甲氧嘧啶、磺胺喹恶啉等7种磺胺类药物残留,优化了色谱条件和样品预处理方法。7种磺胺类药物在0.050 mg/L~10.0 mg/L范围内线性良好,检出限和定量限分别低于0.02 mg/kg和0.04 mg/kg。在0.250 mg/kg和0.500 mg/kg两个添加水平,蛋清中的回收率为81.0%~100%,RSD为0.8%~4.8%,蛋黄中的回收率为72.2%~94.1%,RSD为1.1%~6.9%。  相似文献   

12.
通过运用GC-MS方法对3家润滑油生产企业废酸油渣中的54种挥发性有机物(VOCs)和16种多环芳烃(PAHs)进行定性及定量分析。结果表明,54种VOCs有12种被检出,检出率为22.2%,其中1,2,4-三甲苯在75个样品中均有检出,检出率为100%。54种VOCs质量分数为ND~12.5 mg/kg,其中质量分数较高的化合物为苯(0.6~11.9 mg/kg)、萘(1.0~12.5 mg/kg)、1,2,4-三甲苯(0.5~10.2 mg/kg)。16种PAHs有12种被检出,检出率为75%,其中萘、菲、芘、苯并[a]蒽和■在58个样品中均有检出,检出率为100%。16种PAHs质量分数为2~2 160 mg/kg,其中质量分数较高的化合物为■(25~2 160 mg/kg)、芘(10~207 mg/kg)、苯并[a]蒽(5~108 mg/kg)。同一个企业不同油样之间的VOCs和PAHs检出种类和质量分数存在明显差异,各目标物质量分数与总量之间并不完全相关,这与油源、生产工艺以及样品的风化程度有关。客观上,大部分样本存在不均匀性,因此桶装废酸油渣样品检测应关注采样环节,应根据样品特点采集足够的样本数,保证测定结果真实可靠。  相似文献   

13.
铅锌冶炼废水处理后沉渣重金属元素特征与环境活性研究   总被引:2,自引:1,他引:1  
通过扫描电子显微镜与X射线衍射仪分析、BCR法三步连续提取及元素化学分析,对铅锌冶炼废水处理后沉渣中重金属的赋存状态、环境活性进行研究。结果表明,沉渣中主要毒害元素为Zn、Pb、Mn、Cd和Cu,且以非晶态存在,其含量分别为62350、29530、7650、4530和830 mg/kg。渣中Zn和Cd酸可提取态所占比例较大,分别为37.72%和34.44%; Mn的可还原态相对含量很高,达到49.67%;Zn和Pb的可氧化态含量较高,分别占全量的34.16%、34.68%;Pb和Cu的残渣态含量较高,分别占全量的39.72%和61.69%。  相似文献   

14.
贵州省部分地区土壤中酞酸酯类污染现状调查   总被引:5,自引:1,他引:4  
对贵州省部分地区表层土壤中酞酸酯类的污染状况进行了调查。分别在遵义地区、黔南地区、黔东南地区和毕节地区采集483个土壤样品分析,结果表明,样品中酞酸酯总质量比(ΣPAEs)为未检出~8.22 mg/kg,均值为0.63 mg/kg。其中DEHP和DBP为主要污染物,均值分别为0.32 mg/kg和0.24 mg/kg,检出率分别为90.89%和97.10%。  相似文献   

15.
武江 (乐昌段)水体底泥重金属污染调查   总被引:1,自引:0,他引:1       下载免费PDF全文
对武江乐昌段由上游矿山废水排泄沟、中游霜降河和下游武江段3段水道底泥中Pb、Zn、Cu进行测定.结果表明,Pb的质量比为2.54×103 mg/kg、1.33×103 mg/kg和30.7 mg/kg,Zn的质量比为1.01×103 mg/kg、2.48×103 mg/kg和156 mg/kg,Cu的质量比为42.9 mg/kg、68.8 mg/kg和69.4 mg/kg.3段支水道底泥污染负荷指数(IPL值)分别是14.0、10.6和1.46,整个区域IPL值为6.19,达到极强度污染程度.Pb、Zn总体污染程度比Cu严重,对武江乐昌段及其下游地区存在潜在生态风险.指出,霜降河和废水排泄沟段底泥不能农用,需特别谨慎地疏浚、转运和处置,而武江段底泥则可农用.  相似文献   

16.
Flame retardants (FRs) are useful because they can prevent combustion and delay the spread of fire after the ignition on commercial products containing plastics. However, such commercial products could be a primary source of environmental contamination with FRs. Plastic disks containing FRs were prepared to elucidate changes in the concentrations of the FRs after weathering tests. Acrylonitrile-butadiene-styrene (ABS) and polycarbonate (PC) resin were separately kneaded with a combination of three organic FRs [Dechlorane plus (DP), tetrabromobisphenol A (TBBPA), and triphenyl phosphate (TPhP)] and one inorganic FR [antimony trioxide (Sb2O3)]. The concentrations of TBBPA/TPhP and DP/Sb2O3 in the final preparations were respectively 1000 and 500 mg/kg in compliance with the RoHS directive on organobromine FR. The concentrations of elements in the final preparations were 300 mg/kg for chlorine, 600 mg/kg for bromine, 100 mg/kg for phosphorus, and 400 mg/kg for antimony, respectively. The analytical concentrations (three FRs and four elements) were consistent with the expected concentrations (maximum difference ?9.5% in the PC disks). The FRs and elements in the disks were sufficiently homogenous (maximum inhomogeneity 4.3% in the PC disks). The prepared disks were subjected to weathering tests; the concentrations of TBBPA in the disks decreased significantly (30 to 40%) whereas the concentrations of the elements did not change under the condition of this study. On the other hand, there were no drastic differences on relationships of FRs and elements such as DP/chlorine and TPhP/phosphorus.  相似文献   

17.
The date (Phoenix dactylifera L.) fruits (Soukari, Soulag, Barhi, Khulas, Rozaiz, Soughi and Monaif) were evaluated with respect to some physical and chemical properties. While crude protein contents of fruits change between 1.51 % (Soulag) to 2.41 % (Soughi), crude fibre contents ranged between 1.91 % (Soukari) to 3.90 % (Barhi). Vitamin C contents of date samples changed between 971.82 mg/kg (Soughi) to 1,453.15 mg/kg (Barhi). Antioxidant activity of date fruits ranged from 80.07 IC50 (Soukari) to 81.21 IC50 (Soulag). The highest phenolic content was found in Khulas with a mean value of 198 mg GAE/100 g. Energy values of date fruits ranged from 3,725 kcal/kg (Soulag) to 3,870 kcal/kg (Soukari). Sucrose contents of date fruits changed between 1.02 % (Soulag) to 55.71 % (Soukari). Mineral contents of several date fruits were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Date samples contain potassium at a range between 7,468 mg/kg (Khulas) to 9,619 mg/kg (Soulag). Phosphorus contents of fruits were found between 1,848 mg/kg (Soulag) to 3,066 mg/kg (Rozaiz) and followed by magnesium and calcium. The highest Zn (9.33 mg/kg), Cu (4.27 mg/kg) and Mn (3.26 mg/kg) were found in Rozaiz, Soukari and Barhi samples, respectively.  相似文献   

18.
The mineral contents of Pistacia vera kernels were determined by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The minimum and maximum values of K, P, Ca, Mg, and S elements ranged from 6,333 to 8,064 mg/kg, 3,630 to 5,228 mg/kg, 1,614 to 3,226 mg/kg, 1,716 to 2,402 mg/kg, and 1,417 to 1,825 mg/kg, respectively. In addition, the mean values of Fe, Zn, Cu, Mn, B, Mo, Cr and Ni elements were determined as 42.48, 20.52, 12.81, 7.48, 11.31, 0.106, 0.511 and 1.67 mg/kg, respectively. Ash levels of kernels were found between 2.28 % (Urfa) and 2.79 % (Halebi). In addition, crude oil and protein contents were determined between 48.8 % (Halebi) to 55.3 % (Siirt) and 23.33 % (Uzun) to 27.16 % (Halebi), respectively.  相似文献   

19.
采用固相萃取-气相色谱法测定地表水和底泥中9种硝基苯类化合物。方法在0mg/L—4.00mg/L范围内线性良好,硝基苯和间-二硝基苯的检出限为0.05mg/L(水样)和0.05mg/kg(底泥),其余7种硝基苯类化合物的检出限为0.01mg/L(水样)和0.01mg/kg(底泥),标准溶液平行测定的RSD≤6.5%,地表水和底泥加标回收率分别为85.1%—103%和78.4%—106%。  相似文献   

20.
In this study, aluminium (Al), lead (Pb), cadmium (Cd), selenium (Se) and arsenic (As) contents in milk and different dairy product samples were measured. Pb, Cd, As, Al and Se contents in the milk and different dairy products ranged from 0.054 mg/kg (milk powder)?1.100 mg/kg (Ka?ar cheese), 0.009 mg/kg (whey powder and yogurt)?1.051 mg/kg (Tulum cheese), 0.010 mg/kg (whey powder)?0.146 mg/kg (butter), 2.848 mg/kg (ice cream)?8.778 (drained yogurt) and n.d. (ice cream, milk and whey powder, yogurt, ayran and Lor cheese)?0.434 mg/kg (Tulum cheese), respectively. The 75% of White and Ka?ar cheeses, 50% of Lor and 12.5% of Tulum cheese samples contained higher Pb according to the legal limits established by the Turkish Food Codex and European Communities regulation and 12.5% of Tulum cheese sample contained Cd. It was concluded that Pb contents of milk and dairy products from this region might be highly hazardous to human  相似文献   

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