A theoretical study of the behaviour of ferric phosphate in sea water has been made with existing data. The conditions least favourable for the continued existence of ferric phosphate should occur in the upper layers of the sea during active plant growth. The formation and stability of ferric phosphate is likely to be most favoured under the more acid conditions found in the gut of many animals. Ferric phosphate is likely to be introduced into sea water in animal faeces. Experimental confirmation of this deduction is essential.In all experimental work involving ferric phosphate in sea water, the need is indicated for very accurate control of hydroxyl-ion activity and probably pressure, and for attention to the time factor and to the physical condition of the precipitated phase. The topic is of geochemical as well as of biological interest.Dipyridyl is a reagent for ferrous iron. Reasons are set out why in sea and lake water at high dilutions it may also determine ferric iron without presence of an added reducing agent.Evidence is presented that ferrifluoride plays no part in the iron cycle in he sea.

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关于铁在海中分布的一些化学考虑

利用现有数据对磷酸铁在海水中的行为进行了理论研究。在植物活跃生长期间，最不利于磷酸铁持续存在的条件应该出现在海洋的上层。在许多动物肠道中发现的酸性更强的条件下，磷酸铁的形成和稳定性可能最受青睐。磷酸铁很可能通过动物粪便进入海水。这一推论的实验证实是必不可少的。在所有涉及海水中磷酸铁的实验工作中，需要非常精确地控制羟基离子活性和可能的​​压力，并注意时间因素和物理条件。沉淀相。主题是地球化学以及生物学的兴趣。联吡啶是亚铁试剂。原因是在高稀释度的海水和湖水中，它也可以在不存在添加还原剂的情况下测定三价铁。有证据表明，氟化铁在海中的铁循环中不起任何作用。