石墨炉原子吸收光谱(GFAAS)法测定石英玻璃中硼的研究

试样经氢氟酸分解，通过加入化学改进剂和多次注射浓缩样品及低温、长时间灰化的方法，在硝酸介质中用石墨炉原子吸收光谱法(GFAAS)测定石英玻璃中硼的含量。该方法解决了GFAAS法分析石英玻璃中硼灵敏度低和准确度低的问题。     

GFAAS法测定LiMn2O4中的Pb和Cd

采用石墨炉原子吸收光谱法(GFAAs)测定锂离子电池正极材料LiMn2O4中杂质Pb和Cd的含量.探讨了HNO2浓度、Pb和Cd的灰化温度和原子化温度、基体改进剂对测定结果的影响.该方法的操作简单,准确度高,Pb的回收率为91.22%～93.75%,Cd的回收率为96.5%～108.6%;精密度好,两种元素测定的相对标准偏差RSD(n=lO)<5%.     

石墨炉原子吸收光谱法测定P91钢中Sb的含量

介绍了采用石墨炉原子吸收光谱法测定P91钢中Sb的含量。试样以盐酸、硝酸和高氯酸溶解,通过高氯酸冒烟除去氯化物。将试液移入石墨管中原子化,用Sb无极放电灯作光源,用原子吸收光谱仪于Sb217.6nm波长处测量其吸光度。     

不同前处理方法测定植物油中重金属的研究

考察了湿法消解、干法灰化、微波消解3种不同前处理方法对植物油中重金属含量测定结果的影响。结果表明,硝酸-过氧化氢-高氯酸湿法消解为植物油前处理的最佳方法。采用石墨炉原子吸收光谱法测定植物油中的铅、镉、铬,线性范围内相关性良好,相关系数大于0.99,加标回收率分别为88.2%、94.5%、84.9%,RSD分别为8.5%、5.3%、9.1%,检出限分别为6.21、0.89、1.99μg/kg。该方法耗时短、操作简单,应用于植物油中重金属含量的测定,结果令人满意。     

微波消解-GFAAS法测定小麦粉中铅的含量

本文应用微波消解-石墨炉原子吸收光谱法对小麦粉中铅的含量进行测定。小麦粉经HNO_3+H_2O_2微波消解体系消解后,采用硝酸钯和磷酸二氢铵作为化学改进剂,将灰化温度提高到1100℃,从而大大降低基体的干扰。铅的含量在0～20ng/mL范围内呈线性关系,线性相关系数为0.9953;本法检出限为1.8ng/mL,RSD小于3%,回收率在90%～110%之间。结果表明,该方法操作简便、易行,样品中铅损失少,测定结果重现性好,准确度高,具有很强的实用性。     

微波消解-石墨炉原子吸收法测定中药中痕量镉的研究

本文通过考察各因素对样品消解效果的影响及对石墨炉原子吸收各条件进行优化 ,建立一种快速、有效的中药中镉含量的检测方法 ,方法检出限为 0 0 1 1 9ng·mL- 1,线性范围 0 0 0 6～ 2ng·mL- 1,样品测定回收率 91 7%～ 1 0 4 3% ,结果满意     

GFAAS法和ICP-MS法测定水产品中铅含量的不确定度评定

分别采用石墨炉原子吸收法(graphite furnace atomic absorption spectrometry,GFAAS)和电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)测定质控样品中铅含量,分析不确定度的主要来源,建立水产品中铅测定的不确定度评定的数学模型,分别计算两种方法的各不确定度分量,结果表明:不确定度主要来源于标准曲线拟合、测量结果的重复性、方法回收率、标准溶液配制,GFAAS法测定铅含量的扩展不确定度高于ICP-MS法,两种方法的不确定度分别为7.70、4.39μg/kg,k=2。     

Aluminium in food and daily dietary intake estimate in Greece

Aluminium content of foods, as well as dietary aluminium intake of the Greek adult population, was determined using graphite furnace atomic absorption spectroscopy after microwave sample digestion and food consumption data. Al content ranged from 0.02 to 741.2?mg?kg^?1, with spices, high-spice foods, cereal products, vegetables and pulses found to be high in Al. Differences in aluminium content were found between different food classes from Greece and those from some other countries. Aluminium intake of Greeks is 3.7?mg/day based on DAFNE Food Availability Databank, which uses data from the Household Budget Surveys. On the other hand, according to the per capita food consumption data collected by both national and international organisations, Al intake is 6.4?mg?day^?1. Greek adult population has an Al intake lower than the Provisional Tolerable Weekly Intake of 7?mg?kg^?1 body weight established by EFSA. Cereals and vegetables are the main Al contributors, providing 72.4% of daily intake.     

Investigation of chromium content in foodstuffs and nutrition supplements by GFAAS and determination of changing Cr(III) to Cr(VI) during baking and toasting bread

In our work the chromium content of foodstuffs, spices, beverages and nutrition supplements was determined. We set out to determine in what quantity these satisfy the organism’s daily chromium requirement. We wanted to get an answer about to the question if a sportsman wants to plan his diet from the chromium consumption point of view, does he believe that the data given satisfy the necessary essential amount of chromium content. The results obtained were compared to data published by other authors and data can be found in the Internet. These data do not only differ significantly from the results obtained by us, but from each other as well. At present there is no available literature data to us demonstrating whether toxic chromium compounds can occur from the natural Cr(III) content of cereal milling products used when baking and toasting bread, that is why we considered examining it.     

微波消解—石墨炉原子吸收光谱法测定饲料中镉的含量

研究了利用硝酸作消解试剂微波消解饲料,在赶剩余酸和氮氧化物过程中,添加1~3 mL氢氟酸除去饲料中的硅,得到清澈消解溶液。磷酸二氢铵为基体改进剂,石墨炉原子吸收光谱法测定饲料中镉的含量,结果表明,该法准确度较高,效果良好。