Determination of hydroxyl radical photoproduction rates in natural waters
Determination of hydroxyl radical photoproduction rates in natural waters
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DOI：
10.2116/analsci.20.153
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发表时间：
2004-01-01
影响因子：
1.6
通讯作者：
Sakugawa, H
中科院分区：
文献类型：
--
作者：
Takeda, K;Takedoi, H;Sakugawa, H
采用一种简单、快速、灵敏的苯探针法，通过在线预富集高效液相色谱法测定河水和海水中苯与光化学产生的OH自由基反应生成的苯酚，测定了河水和海水中OH自由基的光化学生成速率。从众所周知的OH自由基源，如硝酸盐，亚硝酸盐和过氧化氢的OH自由基的形成速率，与以前报道的那些很好的协议。含有高浓度硝酸盐和亚硝酸盐的河水样品被发现显示出高的OH自由基形成率。在河水和海水中，10%至80%的OH自由基的形成是由于硝酸盐和亚硝酸盐的光解，但过氧化氢的OH自由基的形成可以忽略不计。OH自由基的形成，从未知来源以外的硝酸盐，亚硝酸盐和过氧化氢是强烈相关的荧光物质的量。
The photochemical formation rates of hydroxyl radicals (OH radicals) in river water and seawater were determined by a simple, rapid and sensitive benzene probe method, in which phenol formed by the reaction between benzene and photochemically-generated OH radicals was analyzed by on-line preconcentration HPLC. The OH radical formation rates from well-known OH radical sources, such as nitrate, nitrite and hydrogen peroxide, were in good agreement with those reported previously. River water samples containing high concentrations of nitrate and nitrite were found to show high OH radical formation rates. Ten to 80% of the OH radical formation in river water and seawater was due to the photolysis of nitrate and nitrite, but OH radical formation from hydrogen peroxide was negligible. The OH radical formation from unknown sources other than nitrate, nitrite and hydrogen peroxide was strongly correlated to the amount of fluorescent matter.