原子荧光光谱法测定痕量金的实验研究与理论探讨  

Experimental and Theoretical Study of Determination of Trace Gold by Atomic Fluorescence Spectrometry

作　　者：程文康 周丽萍[1] 宁新霞 王海军[1] 

机构地区：[1]西安西北有色地质研究院有限公司,陕西西安710054

出　　处：《黄金科学技术》2016年第4期128-132,共5页Gold Science and Technology

摘　　要：研究发现,同时在样品溶液中加入0.04%DDTC、还原剂溶液中加入0.2%DDTC将极大地增强金挥发物的发生效率。将一个带调节阀的转子流量计串联在屏蔽气或载气气路中间,流量计量程为0~1 200 m L/min,进行手动调节,解决了计算机自动调节范围不满足屏蔽气和载气实验条件的问题。结果表明,载气流量为100 m L/min,屏蔽气流量为700 m L/min时可获得最佳的信号强度和信噪比。通过对仪器工作参数和反应体系参数进行优化,使标准溶液检测信号较原子吸收法提高10倍以上。方法用于地质样品中金的检测,结果与火焰原子吸收法相吻合。同时,通过比较DDTC、聚醚型软质聚氨酯泡沫和硫脲分子结构,推测其反应机理指导寻找新的金增敏剂。It is found that the present of 0.04% DDTC in sample solution and 0.2% DDTC in reductant solution at the same time can greatly enhance generation efficiency of volatile species of Au.The problem that computer automatic adjustment range does not meet the experimental conditions of shielding gas or carrier gas can be solved by connecting a rotor flowmeter with control valve in series in shielding （or carrier） gas path.The measuring range of the rotor flowmeter is 0-1 200 mL/min, and it can be adjusted manually.The result shows that the optimal signal intensity and signal-to-noise ratio can be gotten when carrier gas flow rate is 100 mL/min and the shield gas flow rate is 700 mL/min.Signal is above ten times stronger than AAS method after optimizing the parameter of instrument and chemical vapor generation.The method is used in determination of gold of ore sample,the results are consistent with those gotten by flame AAS.The reaction mechanism can be assumed by comparing molecule structure of DDTC,polyurethane foam and thiourea molecules,which will help find new gold sensitizations.

关 键 词：泡沫吸附 原子荧光光谱法 增敏剂 金 

分 类 号：O657.31[理学—分析化学]