Pedro Juana, Stripekis Jorge, Bonivardi Adrián, Tudino Mabel
Area de Química Analítica, Departamento de Química, Facultad de Ingeniería Química, Universidad Nacional del Litoral, Santiago del Estero 2829 (S3000GL.N), Santa Fe, Argentina.
Talanta. 2006 Mar 15;69(1):199-203. doi: 10.1016/j.talanta.2005.09.027. Epub 2005 Oct 27.
The aim of this work is the study of the best conditions for thermal stabilization of tellurium in graphite furnaces under different experimental conditions, including highly concentrated nitric and hydrochloric acids solutions as those resulting of drastic dissolution procedures. The influence of different noble metals used as matrix modifiers in solution or as permanent layers on the graphite furnace will be assessed. Amongst the assayed matrix modifiers, iridium used as permanent has shown the best performance in high concentrations of mineral acids. The mass employed was 20 microg (for 1 ng of Te), with a maximal attainable pyrolysis temperature of 1400 degrees C without losses of the analyte or sensitivity (height, area and form of the atomization peak), being mo=20 pg. Some speculations on the mechanisms of thermal stabilization of tellurium in graphite furnaces will be discussed. The potentiality of ETAAS for tellurium determination in technical grade sulfur will be evaluated. Results involving characteristics mass, limit of detection and percentage of recovery of tellurium in a mineralized sulfur sample will be compared with those obtained through a working curve in absence of interferences.
这项工作的目的是研究在不同实验条件下石墨炉中碲热稳定的最佳条件，包括高浓度硝酸和盐酸溶液，如剧烈溶解过程中产生的溶液。将评估用作溶液中的基体改进剂或石墨炉上的永久涂层的不同贵金属的影响。在所测试的基体改进剂中，用作永久涂层的铱在高浓度无机酸中表现出最佳性能。使用的质量为20微克（对于1纳克碲），在不损失分析物或灵敏度（原子化峰的高度、面积和形状）的情况下，最大可达到的热解温度为1400℃，mo = 20皮克。将讨论关于石墨炉中碲热稳定机制的一些推测。将评估电热原子吸收光谱法（ETAAS）测定工业级硫中碲的潜力。将矿化硫样品中碲的特征质量、检测限和回收率的结果与在无干扰情况下通过工作曲线获得的结果进行比较。
