Study On The Enhancement Methods Of Radiation Intensity Of ICP Source

In this paper, detecting the race elements in water solution by Inductively Coupled Plasma Atomic Emission Spectrometry, the enhancement methods of radiation intensity of ICP was studied. With the rapid development of technology, ICP-AES was extensively applied to the component analysis and the higher level of detection was requested. In order to meet the demand of research and production, some effective measures have been adopted to enhance analysis capacity of spectroscopy instrument so that the detection limit of the analysis were reduced and more accurate analysis results were obtained . These main methods are as follows:1. The effect of 1-propanol as the addition of sample on the emission intensity in the ICP was investigated. The results show that the organic addition was obvious enhance radiant intensity of the ICP source and signal-to-background ratios of spectrum. The optimal experiment condition was confirmed.2. The effect of the electromagnetic field action on the physical property (surface tension and viscosity), nebulization efficiency of sample solution and emission intensity of ICP source. The experimental results show that at magnetic induction intensity is 280mT and magnetization time 10 min, the value of surface tension and viscosity of solution were significantly reduced and nebulization efficiency was improved, led to emission intensity of great majority elements and signal-to-background ratios were enhanced markedly. The plasma parameter (plasma temperature and electron density) has been measured; the excitation capability of analysis elements was improved.3. Easily ionizable element (KCl) was addition to the water solution results of the excitation power of plasma was enhanced. The influence of the different concentration k on the spectral intensity and the signal-to-background ratio of the elements in the samples were studied. The experiment results showed that with the increase of the easily ionizable element concentration, the spectral intensity and signal-to-background ratio were increased at first and then reduced, after that appear a max peak value when reached fixed concentration. In order to move forward a single step discusses to the atomization and excitation mechanism of the ICP source, excitation temperature and electron density were measured in the different easily ionizable element concentration.4. In order to overcome the influence of the matrix effect on the analysis result accuracy, a complementary advantages idea of two quantitative analysis methods (standard curve method and standard addition method) was proposed. With tea sample as case, five trace elements were determined using ICP-AES. After comparative results of two analysis methods, the calibration curve from standard curve method was corrected by the data of method of standard addition.To sum up, the source radiant intensity and the plasma parameter could be increased obviously by the following methods:â‘ The appropriate organic solvent or easily ionizable element were added in the water solution;â‘¡The water solution sample was magnetize action. This is of important vital for the reduction of the analytical detection limits of ICP-AES.