Trial manufacture of an analyzer with a semiconductor detector for greenhouse gases in water

水中温室气体半导体检测分析仪的试制

• 批准号: 07558197
• 负责人: OHTA Keiichi
• 金额: $ 0.38万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07558197/
• 关键词: Gas analyzer; Semiconductor detector; Gases in water; Greenhouse gases; 野外試験; 水中温室効果気体

(1) Assembling and preliminary tests of a gas analyzerA new analyzer for greenhouse gases in water was assembled by connecting four units in a series. They are a purge and trap unit, a gas chromatograph, a detector, and a data processor. As a data processor, we use Chromatopak of Shimadzu Co. Ltd., Japan. The purge and trap unit is consisted of a gas-purging bottle, a cold-trap, and a volume-measuring tube. The gas chromatograph for gas separation contains a gas-separation column and a controller of the column temperature within a range from 40 to 100ﾟC.Nitrogen is used as a carrier gas instead of pure air because of a higher efficiency of nitrogen in separating gas constituents. The detector is a semi-conductor detector installed in an aluminum block which is thermally controlled. The detector temperature is set at 42ﾟC based on the data obtained by preliminary tests. An oxygen inlet and a gas mixing tube is attached to the detector.(2) Field tests of the gas analyzerThe availability of the analyzer was tested at Lake Kizaki and Mikawa Bay. The analyzer showed sensitivity enough to determine in situ concentrations fo hydrogen, carbon monoxide and methane dissolved in fresh-or sea-water samples. It is also shown that the analyzer is useful for hydrogen sulfide at high concentrations. However, the sensitivity was too low to detect nitrous oxide at in situ concentrations.

(1)气体分析仪的组装和初步测试通过四个单元串联组装了一种新型水中温室气体分析仪。它们是吹扫捕集装置、气相色谱仪、检测器和数据处理器。作为数据处理器，我们使用日本岛津株式会社的 Chromatopak。吹扫捕集装置由吹气瓶、冷阱和体积测量管组成。用于气体分离的气相色谱仪包含气体分离柱和柱温在40至100℃范围内的控制器。使用氮气代替纯空气作为载气，因为氮气分离气体成分的效率更高。该探测器是安装在热控制铝块中的半导体探测器。根据初步测试获得的数据，探测器温度设定为42℃。探测器上附有氧气入口和气体混合管。(2)气体分析仪的现场测试分析仪的可用性在木崎湖和三河湾进行了测试。该分析仪的灵敏度足以确定淡水或海水样品中溶解的氢气、一氧化碳和甲烷的原位浓度。还表明该分析仪对于高浓度的硫化氢很有用。然而，灵敏度太低，无法检测原位浓度的一氧化二氮。

项目成果

Terai,H.: "Fluxes of radiatively active gases and microbial processes in Kushiro Wetland." Proc.7th IMCG Field Symp.(Japan).(in press). (1997)

Terai,H.：“钏路湿地的辐射活性气体通量和微生物过程。”

Terai, H.: "Fluxes of radiatively active gases and microbial processes in Kushiro Wetland." Proc. 7th IMCG Field Symp. (Japan).(in press). (1997)

Terai, H.：“钏路湿地的辐射活性气体通量和微生物过程。”

K.Ohta: "Atomospheric organic compounds of marine origin." Proc PACIFICHEM95(Hawaii). 465 (1995)

K.Ohta：“海洋来源的大气有机化合物。”

Ohta, K.: "Photochemical degradation of dissolved organic matter to CO in coastal seawater." TERRAPUB. (in press). (1997)

Ohta, K.：“沿海海水中溶解的有机物光化学降解为二氧化碳。”

Terai, H.: "Fluxes of radiatively active gases and microbial processes in Kushiro Wetland." Proc.7th IMCG Field Symposium (Japan). (in press). (1997)

Terai, H.：“钏路湿地的辐射活性气体通量和微生物过程。”