悬浮体制样石墨炉原子吸收光谱法直接测定食品中的Cu、Zn、Mn

本文提出以 PTFE作为化学改进剂 ,悬浮体制样石墨炉原子吸收光谱法( GFAAS)测定食品中痕量 Cu、Zn、Mn的新方法。对 GFAAS测定 Cu、Zn、Mn的条件进行了优化。在选定的实验条件下 ,测定 Cu、Zn、Mn的特征质量分别为 3.1 pg、0 .8pg和 1 .8pg。采用水溶液工作曲线法直接分析了食品试样中的痕量 Cu、Zn、Mn,其测定结果与参考值相一致。本方法无需任何化学前处理 ,灵敏、简便。

石墨炉原子吸收光谱测定中碱土金属氯化物的背景吸收

研究了石墨炉原子吸收中碱土金属氯化物在１９０～３６０ｎｍ范围的背景吸收，以及灰化温度和原子化温度对背景吸收的影响，讨论了背景吸收对测量的干扰，以及ＨＮＯ３基体改进剂和氘灯扣除背景测量方式对背景干扰消除情况。

石墨炉原子吸收法直接测定固体样品中痕量钴

本文研究了石墨炉原子吸收法直接测定固体样品中痕量钴。该方法无须对样品进行干法或湿法消解 ,将固体样品研磨后 ,过 2 0 0目筛 ,加入 0 .15%琼脂溶液 ,均匀悬浮 ,由石墨炉自动进样测定。本法准确、简单、无玷污、无损失 ,回收率为 90 %— 96%。

石墨炉原子吸收光谱法规定全血铅的方法研究

目的:建立一种新的血铅测定方法。方法:选择测定最佳条件,采用5%的4—甲基氢氧化铵做为一种新的稀释剂,用石墨炉原子吸收法测定全血铅。结果:本法的检出限为11pg,相对标准偏差为2.5%～4,4%,回收率为94%～99%。标准曲线在。0～100μg/L范围内线关系良好。结论:本法简便、快速、灵敏,准确度高,精密度好,适用好大量的日常样品检测,结果满意。

Determination of Cadmium and Lead in Sugarcane by Graphite Furnace Atomic Absorption Spectrometer with Zeeman Correction

[Objective] The aim was to develop a rapid,simple method for determination of cadmium and lead in sugarcane samples by graphite furnace atomic absorption spectrometry.[Method] The method for determination of Cd and Pb in sugarcane by combined graphite furnace atomic absorption spectrometry and microwave digestion was used.[Result] The concentration curve was linear within the range of 0-0.80 μg/L the detection limits of Cd and Pb was 0.015 and 0.030 μg/L,respectively.The precision for elevenfold determination of Cd and of Pb at the 0.40 μg/L level were 1.8% and 2.3%（RSD）,respectively.Recoveries of 96.7%-98.2% for Cd and 104.6%-106.7% for Pb were obtained for two sugarcane samples and one certified reference material.[Conclusion] The proposed method has the advantages of simple operation,high sensitivity,and high efficiency;it was successfully used for determination of Cd and Pb in sugarcane samples.

杞菊地黄丸中铅砷镉铜汞的含量测定

目的 :检测杞菊地黄丸中铅砷镉铜汞的含量 ;建立有效的分析方法。方法 :采用标准加入法 ,在样品中加入硝酸镍、磷酸氢二铵基体改进剂 ,用石墨炉原子吸收测定Pb、As、Cd、Cu的含量 ;在样品中加入酸性氯化亚锡 ,用冷原子吸收测定Hg含量。结果 :回收率 :RSD分别为 :Pb =97.5 %RSD =2 .75 %、As =96 .6 %RSD =2 .2 3%、Cd =98.2 %RSD =1.32 %、Cu =97.8%RSD =1.19%、Hg =98.8%RSD =1.85 %。 结论 :本法准确、灵敏度高、重现性好 。

Chitosan Removes Toxic Heavy Metal Ions from Cigarette Mainstream Smoke

This study investigated the removal of heavy metal ions from cigarette mainstream smoke using chitosan. Chitosan of various deacetylation degrees and molecular weights were manually added to cigarette filters in different dosages. The mainstream smoke particulate matter was collected by a Cambridge filter pad, digested by a microwave digestor, and then analyzed for contents of heavy metal ions, including As（Ill/V）, Pb（II）, Cd（II）, Cr（III/VI） and Ni（II）, by graphite furnace atomic absorption spectrometry （GFAAS）. The results showed that chitosan had a removal effect on Pb（II）, Cd（II）, Cr（III/VI） and Ni（II）. Of these, the percent re- moval of Ni（II） was elevated with an increasing dosage of chitosan. Chitosan of a high deace tylation degree exhibited good binding performance toward Cd（II）, Cr（III/VI） and Ni（II）, though with poor efficiency for Pb（II）. Except As（III/V）, all the tested metal ions showed similar tendencies in the growing contents with an increasing chitosan molecular weight. Nonetheless, the percent removal of Cr（III/VI） peaked with a chitosan molecular weight of 200 kDa, followed by a dramatic decrease with an increasing chitosan mo- lecular weight. Generally, chitosan had different removal effects on four out of five tested metal ions, and the percent removal of Cd（II）, Pb（II）, Cr（III/VI） and Ni（II） was approximately 55%, 45%, 50%, and 16%, respectively. In a word, chitosan used in cigarette filter can remove toxic heavy metal ions in the mainstream smoke, improve cigarette safety, and reduce the harm to smokers.

Content of Cadmium in Poppy Seeds and Poppy Seeds Containing Products Marketed in Czech Republic

Concentration of cadmium in poppy seeds, semi-finished products and baked goods with poppy seeds was determined by graphite furnace atomic absorption spectrometry （GF-AAS）. Homogenous samples of poppy seeds and products containing poppy seeds were digested by means of microwave digestion system by using of nitric acid and hydrogen peroxide as reagents. The measurements were carried out using an atomic absorption spectrometer with Zeeman background correction. Detection limit was 0.003 mg/kg. A total of 208 samples of poppy seeds （from years 2004-2009） and 17 samples of semi-finished and baked goods were analysed. The average content was 0.64 mg/kg （median 0.64 mg/kg） for poppy seeds and 0.079 mg/kg （median 0.069 mg/kg） for semi-finished and baked goods. The relative standard deviation was lower than 5% for all measurements.

The Assessment of Air Pollution during 2013 and 2014 in Tokat Province

This study aimed to determine the amount of total polluting matter emitted into the atmosphere from heating and industrial-based emissions and the total pollution bulk of Tokat city center. The annual cycles of some heavy metal in particulate matters have been investigated at this area in order to elucidate temporal variations as well as major sources processes responsible for their formation. Air particulate samples were collected from three different locations situated around Tokat. These samples were determined for heavy metals by using Flame or graphite-furnace Atomic absorption spectroscopy. Particulate matter concentrations up to 52.43μg/m^3 were observed in sampling area. The initial results of the chemical analysis showed that concentration values of heavy metals in air particles observed were higher than the World Health Organization （WHO） guideline limit values.