ICP光源中载气压力对等离子体辐射强度的影响

为了提高ICP光源等离子体的辐射强度，利用常规同心气动雾化器，增大载气压力，提高样品溶液的雾化效率，并且通过释放掉部分气溶胶的方法，以合适的流速将样品送入等离子体焰。经过测量水样品中元素Ca，Si，Sr和Zn的谱线强度表明，在常规条件下载气压力为0.05 MPa时有谱线峰值强度;当释放掉部分气溶胶以后，在0.07 MPa的载气压力下测得的峰值强度分别提高了38%，79%，45%和70%。另外，使用较高的载气压力并不影响等离子体辐射的稳定性。

Effect of Nebulizer Gas Pressure on the Emission Intensity of ICP

In an attempt to inhance the emission intensity of ICP, a conventional concentric pneumatic nebulizer was used with increased pressure, and the aqueous aerosol was partially let out to modulate the flow velocity of sample solution into the flame of the ICP. In the present work, the emission spectra of elements Ca, Si, Sr and Zn in water samples were measured, and the resuits showed that corresponding emission intensities are the highest at 0. 05 MPa under the conventional condition, and after increasing the nebulizer gas pressure to 0.07 MPa and letting out part of aqueous aerosol, the peak values grew by 38%, 79%, 45% and 70%, respectively. In addition, the stability of the plasma radiation was not affected by the higher nebulizer gas pressure.