摘要
研究采用ELITESXP 5 0型低分辨率四极质谱计 (QMS)在不制备HD标样的条件下精确测量并计算混合气体中的氕氘分压比CH/CD 的方法。标定结果表明 :QMS对H2 及D2 的响应与氕、氘气体压力呈良好线性 ,且有直线斜率K(H2 ) =2K(D2 )的关系 ,并据此推断K(HD) =1.5K (D2 )。对已知氕氘摩尔比为 1 0 1～ 4.0 2的混合气体试样进行了测定 ,计算得到混合气体中的CH/CD 比与给定值间的相对偏差小于 4 0 %。用CD/CH=1.0 5的标准混合气体进行了方法验证 ,4次测定的CD/CH 平均值为1 0 7,与标准值的相对偏差为 1 9%。验证实验证实 :所推断出的K(HD) =1.5K(D2 )关系是可靠的 ,利用此型号四极质谱计可较精确地测定氕、氘混合气体中的氕氘比CH/CD。
Using a ELITE SXP 50 quadrupole mass spectrometer(QMS) with lower resolution, a method of accurately measuring the C H/ C D ratio in H 2 D 2 mixture without preparing the HD standard sample is proposed. A good linear relation between QMS response to H 2 and D 2 and component partial pressure is verified and the relation of two straight line slopes is K (H 2)= 2K (D 2). According to this fact, the relation K (HD) =1.5 K (D 2) is deduced. Various H 2 D 2 mixtures are used to verify the method and the relative deviation between C H/ C D measured and given values is less than 4.0%. The H 2 D 2 standard mixture ( C D/ C H=1.05) is measured to verify the reliability of the method. The measured C D/ C H average value is 1.07 and relative deviation between measured average value and standard value is 1.9%. It is found that the deduced relation K (HD)=1.5 K (D 2) is reliable and the C H/ C D ratio of various H 2 D 2 mixtures could be accurately measured by using this type QMS.
出处
《原子能科学技术》
EI
CAS
CSCD
2002年第4期462-465,共4页
Atomic Energy Science and Technology
