悬浮液进样-火焰原子吸收光谱法测定土壤中铜

应用悬浮液进样火焰原子吸收光谱法,成功地测定了土壤中的铜。在制备土壤样品悬浮液过程中,对悬浮液的酸量、悬浮剂的浓度及土壤样品粒度的影响等均进行了试验。样品在( 105±2 )℃下烘干4h,研磨过200目筛,加入1 5g/L琼脂悬浮剂10mL和适量硝酸,使样品呈0 2mol/L硝酸悬浮液,充分混合振荡,直接上机测定。通过测定国家土壤标准参考物质,表明该法准确可靠。为进一步验证该法的适用性,又测定了实际土壤样品,且与常规法作了对比,表明两种方法的测定结果一致,而悬浮液的制备更为快速简便。     

微波消解-火焰原子吸收光谱法测定芦苇笋中的镉

采用密闭微波消解-火焰原子吸收光谱法对洞庭湖区芦苇笋中的镉进行了测定.结果表明,密闭微波消解是一种非常有效的植物样品前处理方法,对国家标准物质灌木枝叶的测定结果与推荐值吻合,表明该方法准确可靠.     

微波消解-火焰原子吸收光谱法测定土壤中的锶

建立了微波消解-火焰原子吸收光谱法测定土壤中锶的方法.用微波消解土壤、电热板加热赶酸的方法对土壤样品进行前处理,优化了微波消解条件.检出限为3.0 mg/kg,加标回收率为84.7％ ～ 107％,相对标准偏差均小于5％.方法快速、简便、准确度高、线性范围宽.     

火焰原子吸收光谱法测定底泥中铜铅镍锌镉铬的10种消解方法的比较

湖泊底泥中重金属含量的多寡对水产养殖业的影响以及其底泥能否作为农田肥料都至关重要。目前有关底泥中重金属的测定,原子吸收光谱法是较理想的一种方法。由于对底泥样品所用的前处理方法不同,有时会使测定结果有明显的差异。为此,今对常用的10种消解法[1-6]进行全面、系统的试验比较,供参考。1　试验1 1　主要仪器与试剂AA6800火焰原子吸收光谱仪,岛津;铜、铅、镍、锌、镉、铬单元素空心阴极灯,上海电光器件公司;混合金属标准溶液:铜、铅、镍各为25 0mg/L,锌、铬各为10 0mg/L,镉2 50mg/L;所用试剂除过氧化氢为分析纯外,其余均为优级…     

络合萃取-火焰原子吸收光谱法测定怀山药中铅

建立了DDTE络合、四氯化碳萃取、火焰原子吸收光谱测定怀山药中铅的方法,优化了试验条件,讨论了共存离子的影响。方法在0mg／L-2．00mg／L范围内线性良好,检出限为0．027mg／L,样品测定的相对标准偏差为3．5％,加标回收率为92．1％-102％。     

火焰原子吸收光谱法测定畜禽粪便中铜和锌

采用冻干法-全量酸消解-火焰原子吸收光谱法测定畜禽粪便中铜和锌,优化了试验条件.铜和锌分别在0 mg/L～3.00 mg/L和0 mg/L～1.00 mg/L范围内线性良好,检出限分别为6 mg/kg和2 mg/kg(按取0.5 g试样消解定容至50 mL计算),粪便试样测定的RSD分别为1.3%和3.7%,加标回收率分别为104%和107%.     

原子吸收光谱法测定废气中的镉和铅

用硝酸和过氧化氢进行消解,用火焰原子吸收光谱法测定了废气固定源中的镉和铅,用石墨炉原子吸心光谱法测定了废气散源中的镉和铅。     

火焰原子吸收光谱法测定水中银

采用硝酸消解样品,氘灯背景校正技术消除非特征吸收和光散射影响,火焰原子吸收光谱法测定水中银,方法简便可靠,检出限为0.010 mg/L,RSD为0.9%～6.6%,加标回收率为93.0%～101%.     

火焰原子吸收法测定大气降尘中的铜,铅,锌,镉

火焰原子吸收法测定大气降尘中的铜、铅、锌、镉康新立（山西省运城地区环保局０４４０００）杨俊玲（山西省运城地区药检所０４４０００）大气中重金属的测定，以往是将大气中重金属采集到氯乙烯滤膜上，用氯仿溶解滤膜后，直接用火焰原子吸收法进行测定，由于含量较低，...     

火焰原子吸收法测定土壤中的铅

建立了一种以 HNO3-HCl-HCl O4 -HF对土壤样品进行消化 ,火焰原子吸收测定铅的方法。该法用于实际样品的测定时 ,相对标准偏差小于 2 .3 % ,加标回收率为 98%～ 1 0 2 %。     

火焰原子吸收光谱法测定烟囱烟灰中的铊

提出了火焰原子吸收光谱法测定冶炼厂烟囱烟灰中铊的分析方法。试验表明:方法检测限(3σ)为0 11mg/L,回收率在92%～103%之间,相对标准差<3%,方法简便快速。     

石墨炉原子吸收法测定食用菌中镉和铅

采用塞曼效应背景校正、最大功率升温和峰面积积分,以钯和抗坏血酸为基体改进剂,用恒温平台石墨炉原子吸收法测定食用菌中镉和铅,检出限镉为5.0×10-13g,铅为4.0×10-12g,相对标准偏差在2.8%~7.1%之间,加标回收率镉为92.0%~104%,铅为89.3%~95.0%。     

碱消解-火焰原子吸收分光光度法测定固体废物中的六价铬

采用碱消解-火焰原子吸收分光光度法测定固体废物中的六价铬,样品消解温度控制在90 ℃～95 ℃范围内,消解时间为1 h,消解液pH值调节至9.0±0.2。方法检出限与测定下限分别为0.05 mg/kg与0.20 mg/kg,对不同基体实际样品平行测定的RSD为1.4%～13.0%,加标回收率为93%～130%。     

火焰原子吸收分光光度法测定鱼内脏及河流底泥中的铜

采用火焰原子吸收分光光度法测定鱼内脏及河流底泥中的铜。鱼内脏经组织捣碎机捣成匀浆后,加硝酸消解;底泥则经氢氟酸和高氯酸消化。该方法具有灵敏度高,精密度和回收率较好等特点。     

基于改进火焰原子吸收光谱的土壤六价铬分析

针对分离和萃取环节,对火焰原子吸收光谱测定土壤中六价铬的方法加以改进。采用聚合氯化铝为絮凝剂、异戊醇为萃取剂,使三价铬和六价铬有效分离,并减少了测试干扰。考察了聚铝试剂用量和萃取液振荡时间对测定的影响,并将该方法与EPA 3060A方法和未改进的火焰原子吸收光谱法比较,表明改进后的方法能用于土壤中六价铬的测定。     

萃取富集—火焰原子吸收法测定环境水中痕量砷

联合应用高效雾化器、缝式石英管火焰原子吸收法,采用萃取富集技术测定砷,使砷的灵敏度改善267倍,同时消除了大量盐类的干扰,避免了钠、铝等对石英管的损坏。考察了溶液酸度、碘化钾用量、共存离子等因素对实验的影响。该方法的线性范围为0～25μg／L,检出限为。3μg／L,相对标准偏差为3．2％,回收率为97．8％～101．0％,用于环境水样中痕量砷的监测,结果令人满意。     

Investigation of heavy metal contaminations in the lower Sakarya river water and sediments

In this work, water and sediment samples were collected from three different stations located along the Sakarya river between May and September 2003. Lead, copper, chromium, zinc, nickel and cadmium concentrations were determined by using solvent extraction and flame atomic absorption spectrometric method. The results show that differences based upon sampling times, regions, sediment and water samples were observed. The mean levels of copper, nickel, chromium, lead, cadmium, zinc for sediment samples are; 4.630 μg g⁻¹, 13.520 μg g⁻¹, 8.780 μg g⁻¹, 2.550 μg g⁻¹, 9.990 μg g⁻¹ and for water samples are; 0.851 μg g⁻¹, 1.050 μg g⁻¹, 0.027 μg g⁻¹, 1.786 μg g⁻¹, 0.236 μg g⁻¹, 0.173 μg g⁻¹, respectively.     

Plant Uptake/Bioavailability of Heavy Metals from the Contaminated Soil after Treatment with Humus Soil and Hydroxyapatite

Cellulose nitrate membrane filter was used for the preconcentration-separation of Cu, Co, Cd, Pb and Cr ions. The analyte ions were collected on the membrane filter by the aid of carmine. Then membrane filter was dissolved by using nitric acid. The levels of the analytes in the final solutions were determined by flame atomic absorption spectrometry (FAAS). The analytical parameters including pH, amounts of carmine, sample volumes etc. have been optimized. No influences have been observed from the matrix ions. The detection limits for analytes were in the range of 0.08 μg/l-0.93 μg/l. The validation of the procedure was checked by the analysis of standard reference sediment (GBW 07309). The present method has been successfully applied for the FAAS determinations of analyte ions in real samples including black tea and magnesium salts.     

Determination of total chromium by flame atomic absorption spectrometry after coprecipitation by cerium (IV) hydroxide

A method for the preconcentration of the total chromium based on coprecipitation with cerium (IV) hydroxide is proposed for determination of chromium by flame atomic absorption spectrometry. Different factors including carrier element amount, pH, sample volume and matrix ion effects for the precipitation were examined. The detection limit of the total chromium (k = 3, N = 15) was 0.18 μg l⁻¹. The presented method was applied for the determination of chromium in the wastewater samples from Kayseri and Nigde Organized Industrial Region-Turkey and in drinking water from our laboratory, Kayseri with satisfactory results (relative standard deviations below 8%, recoveries 95%). The analytical results obtained by the proposed method for certified copper sample was in good agreement with the certified value.