CAJ | 학술논문

为了改变水溶液的物理性质，提高IC P发射光谱的辐射强度，实验采用波长为976 nm的近红外激光和10.6μm的CO2激光正交辐照水溶液，研究了不同激光功率密度和辐照时间对水溶液表面张力和粘度的影响，也探讨了处理后水溶液对IC P光谱强度的增强作用。实验结果表明，在976 nm激光功率密度为0.2657 W?cm －2，CO2激光为0.2069 W?cm－2以及辐照时间为40 min条件下，水溶液的表面张力和粘度比未进行激光处理时的分别减小了42.13％和14.03％，而雾化效率升高了51.26％。将优化条件下激光处理的水溶液引入ICP光源后发现，样品元素As ，Cd ，Cr ，Hg和Pb的光谱强度比水溶液未处理时的分别提高了46.29％，94.65％，30.76％，33.07％和94.58％，信背比分别增大了43.84％，85.35％，28.71％，34.37％和90.91％；等离子体温度和电子密度也分别升高了5.94％和1.18％。可见，双光束激光正交辐照水溶液的方法能够明显降低水溶液的表面张力和粘度，提高IC P光源的辐射强度，这为顺利检测水样品中痕量重金属元素创造了条件。
위료개변수용액적물이성질，제고IC P발사광보적복사강도，실험채용파장위976 nm적근홍외격광화10.6μm적CO2격광정교복조수용액，연구료불동격광공솔밀도화복조시간대수용액표면장력화점도적영향，야탐토료처리후수용액대IC P광보강도적증강작용。실험결과표명，재976 nm격광공솔밀도위0.2657 W?cm －2，CO2격광위0.2069 W?cm－2이급복조시간위40 min조건하，수용액적표면장력화점도비미진행격광처리시적분별감소료42.13％화14.03％，이무화효솔승고료51.26％。장우화조건하격광처리적수용액인입ICP광원후발현，양품원소As ，Cd ，Cr ，Hg화Pb적광보강도비수용액미처리시적분별제고료46.29％，94.65％，30.76％，33.07％화94.58％，신배비분별증대료43.84％，85.35％，28.71％，34.37％화90.91％；등리자체온도화전자밀도야분별승고료5.94％화1.18％。가견，쌍광속격광정교복조수용액적방법능구명현강저수용액적표면장력화점도，제고IC P광원적복사강도，저위순리검측수양품중흔량중금속원소창조료조건。
In order to change the physical properties of aqueous solution and improve the radiation intensity of the ICP emission spectrum ,the effects of different laser power density and irradiation time on the surface tension and viscosity of aqueous solution were investigated by using near infrared laser at 976 nm and CO2 laser at 10.6 μm to irradiate aqueous solution orthogonally , then the enhancement of ICP spectral intensity with processed solution was discussed .The results showed that the surface ten-sion and viscosity of aqueous solution reduced by 42.13% and 14.03% compared with the untreated ,and the atomization effi-ciency increased by 51.26% at the laser power density 0.265 7 W?cm -2 of 976 nm and 0.206 9 W?cm -2 of CO2 laser with 40 min irradiation time .With the optimized aqueous solution introduced into the ICP source ,the spectral line intensity of sample el-ements As ,Cd ,Cr ,Hg and Pb was enhanced by 46.29% ,94.65% ,30.76% ,33.07% and 94.58% compared to the untreated aqueous solution ,while the signal-to-background ratio increased by 43.84% ,85.35% ,28.71% ,34.37% and 90.91% ,respec-tively .Plasma temperature and electron density also increased by 5.94% and 1.18% respectively .It is obvious that the method of double-beam laser orthogonal irradiation on solution can reduce the surface tension and viscosity of aqueous solution signifi-cantly ,and raise the radiation intensity of ICP source ,and will provide a better condition for detecting the trace heavy metal ele-ments in water samples .