【摘要】 本文叙述采用240C型元素分析仪同时测定海水中颗粒有机碳和氮。用专制的过滤器过滤海水,此过滤器具有刻度和带有过滤头。直径25mmWhatman GF/C玻璃纤维膜作为滤膜。带有颗粒有机物的滤膜于室温下在真空干燥器中干燥。滤膜卷成圆筒状并塞入石英管中,然后加入三氧化钨作为催化剂。石英管放入我们改进的石英样品勺中,然后样品送入燃烧室。整个系统用氦冲洗90秒,然后冲以氧,样品在氧中静态燃烧并定量转换。生成的二氧化碳、水和氮用热导池检测器分别测定,含量由计算机直接显示。以乙酰苯胺作为标准试剂。本方法的检测极限碳为5μgC/1,氮为lμgN/1。更多还原

【Abstract】 This paper describes the use of Model 240C Elemental Analyzer for a simultaneous determination of particulate organic carbon and nitrogen in sea-water.Seawater was filtered with a special hand syringe,which was graduated and had a filter head. Whatman GF/C glass fibre memberance of 25 mm diameter was used as the filter. The particulate organic matter with the filter was dried in a vaccum desiccator at room temperature. Each rolled filter was folded and compressed into a quartz tube. Then tungstic oxide was added as catalyst. The quartz tube was placed in a modified quartz sample ladle, and then the sample was sent to the combustion chamber. The entire system was purged with helium for 90 seconds and then flushed with oxygen. Sample in the pure oxygen was definitely converted in a static combustion. The produced carbon dioxide, water, and nitrogen were determined separately by a heat conductivity detector. The contents were directly showed on a computer. Acetanilide was used as the standard regent. The detection limit was 5μg C/L for carbon and lug N/L for nitrogen.更多还原