Investigation of source and sink of HONO which is an important radical source in the atmosphere

大气中重要自由基源HONO的源汇研究

• 批准号: 13680608
• 负责人: TAKENAKA Norimichi
• 金额: $ 2.69万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680608/
• 关键词: Nitrous acid; photochemical reaction; OH radical; dew; Nitrogen cycle; Freezing; Evaporation; Acid rain; 相変化; フローインジェクション; 土壌窒素; 自動車排気ガス; 窒素酸化物; オキシダント; フローインジェクション分析; 連続測定; 自動車排ガス; 拡散デニューダー; 二酸化窒素

In the first year, a new determination method for trace amounts of HONO by flow injection analysis has been developed. HONO concentration in 17 seconds-average can be determined every 5 minutes. The detection limit is 15 ppt. With this method, it is found that decrease in HONO concentration in mid-night, peak concentration after sunrise and relatively high level of HONO in daytime. In the second year, this method is improved to continuous method and applied to measure HONO from soil. In laboratory experiment, it is found that an interaction of ammonium salts with NO_2 produces HONO.In the evaporation process, composition in aqueous solution determines mainly fates of nitrite, ammonium, acetate and formate, and it is found that amounts of carbonate combined with calcium plays an important role for the fates of die above solutes. The freezing process affects the fate of HONO, and the theoretical solution of freezing reaction has been build up with a reaction of sulfide with hydrogen peroxide.By researches for two years, the characteristics of HONO concentration profile can be clarified. The continuous research for this field will lead a clarification of HONO source and sink and an understanding of nitrogen cycle in the environment.

在第一年，我们发展了流动注射分析测定痕量HONO的新方法。17秒内的HONO浓度-平均值可以每5分钟测定一次。检测限为15 ppt。结果表明，HONO浓度在午夜下降，在日出后达到峰值，白天浓度相对较高。第二年，将该方法改进为连续法，并应用于土壤中HONO的测定。在实验室条件下，铵盐与NO_2的相互作用产生HONO，在蒸发过程中，水溶液的组成主要决定了亚硝酸盐、铵、乙酸盐和甲酸盐的去向，并且发现碳酸盐与钙结合的量对上述溶质的去向起着重要的作用。冻结过程影响HONO的归宿，以硫化物与过氧化氢反应为例，建立了冻结反应的理论解，通过两年的研究，阐明了HONO浓度分布的特征。这一领域的持续研究将有助于阐明HONO的源和汇，并有助于理解氮在环境中的循环。

项目成果

N. Takenaka, H. Soda, T. Sawotome, H. Terada, H. Bandow and Y. Maeda: "Dew Chemistry in the Drying Process"Proc. of 2nd International Conference on Fog and Fog Collection. 325-328 (2001)

N. Takenaka、H. Soda、T. Sawotome、H. Terada、H. Bandow 和 Y. Maeda：“干燥过程中的露水化学”Proc。

K.Sato, N.Takenaka, H.Bandow et al.: "Oxidative Reaction of Thiosulfate with Hydrogen Peronde by Freezing"Bull. Chem. Soc. Jpn.. (accepted for publication).

K.Sato、N.Takenaka、H.Bandow 等人：“硫代硫酸盐与氢过氧化氢的冷冻氧化反应”Bull。

N.Takenaka, S.Furuya, K.Sato, H.Bandow, Y.Maeda, Y.Furukawa: "A Rapid Reaction of Sulfide with Hydrogen Peroxide and a Formation of Different Final Products by Freezing Compared to those in Solution"Int. J. Chem. Kinet.. 35. 198-205 (2003)

N.Takenaka、S.Furuya、K.Sato、H.Bandow、Y.Maeda、Y.Furukawa：“硫化物与过氧化氢的快速反应，并通过冷冻形成与溶液中不同的最终产物”Int。

N. Takenaka, H. Soda, K. Sato, H. Terada, T. Suzue, H. Bandow and Y. Maeda: "Difference in Amounts and Composition of Dew from Different Types of Dew Collectors"Water Air Soil Pollut.. in press.

N. Takenaka、H. Soda、K. Sato、H. Terada、T. Suzue、H. Bandow 和 Y. Maeda：“不同类型露水收集器的露水量和成分差异”水、空气、土壤污染..

N.Takenaka, H.Soda, T.Sawotome, H.Terada, H.Bandow, Y.Maeda: "Dew Chemistry in the Drying Process"Proc. of 2nd International Conference on Fog and Fog Collection. 325-328 (2001)

N.Takenaka、H.Soda、T.Sawotome、H.Terada、H.Bandow、Y.Maeda：“干燥过程中的露水化学”Proc。