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利用HIDEN公司HPR40溶解气体质谱分析仪,通过实验探索和实际应用,建立了连续走航高频率同时测定海水中O_2、Ar和CO_2等多种气体的分析方法。通过选择硅树脂膜的循环水取样器、进样流量为220 m L/min、进样平衡温度低于海水2℃等实验条件,建立了船载连续走航系统,实现了利用膜进样质谱仪(MIMS)连续走航测定表层海水O_2/Ar比值和p CO_2。所用仪器稳定性良好,连续测定12 h大气鼓泡48 h后的海水样品获得O_2、Ar和CO_2的精密度分别为1.57%、3.75%和2.21%,O_2/Ar的精密度为2.61%;该方法的重复性好,10 d内绘制7条CO_2工作曲线斜率的相对标准偏差RSD=4.18%。应用该方法在南海北部陆坡19.8°N~20.8°N,114.7°E~115°E断面进行调查并取得了很好的效果,结果表明:该调查断面的生物氧过饱和量Δ(O_2/Ar)为0.56%±1.02%,其变化范围为-2.52%至3.34%,调查断面的pCO_2值为361.53±40.46μatm。该方法具有直接、快速、高时空分辨率测定多种溶解气体的优点,为认识多组分气体的高分辨时空分布格局,深入开展我国陆架边缘海生物过饱和氧、海洋群落净生产力和pCO_2动力学研究提供了新方法。
By means of HPR40 dissolved gas mass spectrometer from HIDEN Company, the analytical method of continuously scanning high frequency and simultaneous determination of various gases such as O_2, Ar and CO_2 in seawater was established through experimental exploration and practical application. By selecting the recirculating water sampler of silicone membrane, the flow rate of injection was 220 m L / min, the equilibrium temperature of injection was lower than that of seawater at 2 ℃, a continuous shipboard navigation system was established, Apparatus (MIMS) was used to determine O_2 / Ar ratio of surface seawater and p CO_2. The precision of O_2, Ar and CO_2 was 1.57%, 3.75% and 2.21%, respectively, and the precision of O_2 / Ar was 2.61%. The precision of the instrument was good. The repeatability of the method is good, and the relative standard deviation (RSD) of the slopes of 7 CO 2 curves plotted within 10 days is 4.18%. This method was applied to the survey of 19.8 ° N ~ 20.8 ° N and 114.7 ° E ~ 115 ° E sections in the northern South China Sea. The results show that the biosorption supersaturation Δ (O 2 / Ar ) Was 0.56% ± 1.02%, which ranged from -2.52% to 3.34%. The pCO_2 value of the surveyed section was 361.53 ± 40.46μatm. The method has the advantages of direct, rapid and high space-time resolution in determining dissolved gases. In order to understand the high-resolution space-time distribution pattern of multicomponent gas, the method of deep-sea ocean subsurface over-saturated oxygen, marine community net productivity and pCO_2 power Study provides a new method.