Oxidation of iodide to iodate by cultures of marine ammonia-oxidising bacteria

Oxidation of iodide to iodate by cultures of marine ammonia-oxidising bacteria
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海洋氨氧化细菌培养物将碘化物氧化为碘酸盐

DOI:
10.1002/essoar.10503313.2
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Hughes C
Hughes C
中科院分区:
--
文献类型:
--
作者:
Hughes C

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海洋表面与碘化物(I-)的反应是大气臭氧的重要汇,并引起海洋空气中活性碘的排放,从而进一步破坏臭氧。为了将这一过程纳入化学运输模型,需要更好地了解控制海洋碘物种形成的因素,特别是海洋表面碘浓度。I-氧化为碘酸盐(IO3-)是海洋I-的主要吸收途径,但其机制尚不清楚。我们首次证明了海洋硝化细菌介导I-氧化为IO3-。在提供9-10 mM I-的氨氧化细菌亚硝酸单胞菌(Nitrosomonas sp., Nm51)和海洋亚硝酸球菌(Nitrosoccocus oceani, Nc10)的培养中,与仅培养基对照相比,IO3-浓度显著增加,表明I-氧化为IO3-。亚硝酸单胞菌和海洋亚硝基球菌的细胞标准化产出率分别为15.69(±4.71)fmol IO3- cell-1 d-1和11.96(±6.96)fmol IO3- cell-1 d-1,产碘与亚硝酸盐的摩尔比分别为9.2±4.1和1.88±0.91。对亚硝酸盐氧化细菌的初步实验表明,没有证据表明I-氧化为IO3-。如果这里观察到的氨和I-氧化之间的联系具有代表性,那么我们的海洋碘循环模型预测,未来海洋硝化作用的变化可能会改变全球海面I-场,对大气化学和空气质量产生潜在影响。
Reaction with iodide (I-) at the sea surface is an important sink for atmospheric ozone, and causes sea-air emission of reactive iodine which in turn drives further ozone destruction. To incorporate this process into chemical transport models, improved understanding of the factors controlling marine iodine speciation, and especially sea-surface iodide concentrations, is needed. The oxidation of I- to iodate (IO3-) is the main sink for oceanic I-, but the mechanism for this remains unknown. We demonstrate for the first time that marine nitrifying bacteria mediate I- oxidation to IO3-. A significant increase in IO3- concentrations compared to media-only controls was observed in cultures of the ammonia-oxidising bacteria Nitrosomonas sp. (Nm51) and Nitrosoccocus oceani (Nc10) supplied with 9-10 mM I-, indicating I- oxidation to IO3-. Cell-normalised production rates were 15.69 (±4.71) fmol IO3- cell-1 d-1 for Nitrosomonas sp., and 11.96 (±6.96) fmol IO3- cell-1 d-1 for Nitrosococcus oceani, and molar ratios of iodate-to-nitrite production were 9.2±4.1 and 1.88±0.91 respectively. Preliminary experiments on nitrite-oxidising bacteria showed no evidence of I- to IO3- oxidation. If the link between ammonia and I- oxidation observed here is representative, our ocean iodine cycling model predicts that future changes in marine nitrification could alter global sea surface I- fields with potential implications for atmospheric chemistry and air quality.
亚硝酸盐对分光光度法测定海水中碘酸盐的影响
DOI: --
发表时间: 1977
期刊:
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