原子光谱测定中表面活性剂对铅锌矿粉末悬浮液雾化效率的影响

滇黔地区的"白泥塘层"与锰矿具有密切的成因联系,前人对其地球化学特征研究时关注的主要是硅质灰岩全岩,并非硅质成分本身,而硅质岩全岩能否真实地反映"白泥塘层"中硅质的来源有待研究。本文以滇黔地区"白泥塘层"硅质灰岩为研究对象,用盐酸去除硅质灰岩中的碳酸盐矿物,获得成分较为单一的硅质组分,采用ICP-MS和ICP-OES测定全岩与去除碳酸盐的硅质组分中的微量元素,通过对比两者的微量元素地球化学特征研究"白泥塘层"中硅质的来源问题。结果表明:去除碳酸盐的硅质组分的Th/U=0.02~0.05,低于全岩的Th/U值(0.08~0.2),Eu/Eu^*=0.86~1.54(均值1.15),显示为正Eu异常,此特征不同于全岩(全岩的Eu/Eu^*=0.87~0.93,均值0.90,显示为弱的负Eu异常);硅质组分及全岩的稀土含量均表现为轻稀土较重稀土富集,但硅质组分中的轻稀土所占比重大于全岩。以上特征确切地表明了"白泥塘层"硅质灰岩中的硅质成分来自于热水,对于解释二叠系时期锰矿的形成具有重要的指示意义。

Effect of the Surfactants on Atomization Efficiency of Lead Zinc Mineral Powder Suspension Determined by Atomic Spectrometry

Suspension sampling atomic spectrometry is a kind of the developing green analytical chemistry methods, because it can reduce sample pretreatment process and avoid using the acid and alkali chemical reagents which will produce environmental pollution. The surface tension of suspension coming from polyacrylic acid sodium, polyethylene oxide, sodium hexametaphoshpate and sodium citrate with lead zinc mineral powder was detected by surface tension instrument. At the same time, the atomization efficiency was evaluated and optimized using atomizer in Flame Atomic Absorption Spectrometry (FAAS). The atomization efficiency of the aqueous solution and dispersants was enhanced with the increasing of surfactants concentration and it achieved the maximum at some concentration. And different surfactants have different variation tendency. The results show that the polyethylene oxide prepared suspension with 2 g/L surfactant concentration has a relatively high atomization efficiency. However, the sodium polyacrylate prepared suspension with 5 g/L surfactant concentration has higher atomization efficiency which can even reach to 20%. It could be inferred that the surfactants improve the stability of suspensions and atomization efficiency which could be applied in the detection by atomic spectroscopy.