Research On Analysis And Testing Of Multiple Elements In The Gold-loaded Resin Material Based On The Atomic Spectrometry

In recent years, the import volume of gold-loaded resin materials has been increasing with ascending tendency, but because of the lack of relevant inspection standards brought great difficulties for the inspection and quarantine unit.Aim at above problem, An accurate, rapid, effective and practical analysis method is established in this study.Analysis method for twelve conventional detection elements in the gold-loaded resin materials by using inductively coupled plasma atomic emission spectrometry(ICP-AES) was studied :1. Sample pretreatment method was determined, including the experimental contrast of dissolution method and the melting method, both of which can effectively and thoroughly digest the sample. 2. the working condition of ICP-AES instruments was optimized. The optional working conditions of the instrument contain were : RF transmission power :1150W, auxiliary gas flow : 0.50 L/ min, atomized gas pressure : 30.1psi, cleaning time : 40 s, peristaltic pump rotational speed : 100 r / min, integral time including 10-second long wave and15-second shortwave, the 5% testing hydrochloric acid medium and the matric matching method used to correct the matric effects. 3. the precision RSD for the elements tested in the sample were less than 3%, while the standard addition recovery ranges were between 85%~105%.Analysis method for valuable elements, which are gold and silver,by using flame atomic absorption spectrometry(FAAS) was studied : Sample pretreatment method was determined,using the plastic foam absorption method to pretreat the sample and test the content of gold element; using the high-temperature ashing method to pretreat the sample and test the content of silver element. Both of the two pretreatment methods were optimized and sample was digested completely.2. the working conditions of FAAS instruments was optimized, optional condition was: slit width of 0.7nm, a 10 m A lamp current for both elements and an acetylene/air ratio of1.5/20. 3.the precision RSD for both elements were less than 4% and the standard addition recovery rates of old element were 89% ~92% while the recovery rates for silver element were 87%~95%.The harmful element-----arsenic was analyzed by atomic fluorescence spectrometry(AFS): 1. Sample pretreatment method was determined. Microwave digestion method was used to pretreat the sample,optimized the digestion conditions,and the sample was digested completely. 2. the working conditions of AFS instruments was optimized. The optimal testing conditions were: atomizertemperature of 1000℃, lamp current of 40 m A, carrier gas flow of 400 m L/min and shielding gas flow of 800 m L/min. 3. the precision RSD of the arsenic element in the sample is less than 3%, while the standard addition recovery rates were94.3%~100.6%.The harmful element------ mercury is analyzed by direct sampling-cold atomic absorption spectrometry: 1. No need for sample pretreatment in this method, which shortened the testing time greatly and effectively addressed the problems caused by the losses of mercury due to the pretreatment. 2. the precision RSD of the mercury element in the sample was less than 1%, while the standard addition recovery rates were 91.4%~103.3%.