Phosphorus In River Water Research Articles

Concentration, fractionation and characterisation of soluble organic phosphorus in river water entering lough neagh

The mean concentration of soluble organic phosphorus in the 6 major rivers entering Lough Neagh from 1975 to 1979 was 38 μg P 1 −1. Soluble organic phosphorus constituted 16% of the total phosphorus input during this period. The chemical nature and availability for algal growth of soluble organic phosphorus is largely unknown. An adsorption-precipitation technique for concentrating soluble organic phosphorus from 1001. volumes of river water was developed using lanthanum. From the lanthanum-phosphorus precipitate acid-soluble and alkali-soluble concentrated solutions of organic phosphorus were obtained. 25% of the soluble organic phosphorus from 6 river samples was acid-soluble and 40% was subsequently alkali-soluble. These concentrated solutions were subjected to gel filtration chromatography on a preparative scale using Sephadex G-50 and G-75 when soluble organic phosphorus compounds were fractionated by molecular weight. Of the acid-soluble organic phosphorus 40% was of mol. wt> 10,000, 20% was of mol. wt between 10,000 and 1500 and 40% was of mol. wt < 1500. When the alkali-soluble organic phosphorus was fractionated 70% was of mol, wt > 50,000. Although the acid-soluble concentrates were yellow in colour and may have contained fulvic acids, further gel filtration chromatography of the acid-soluble organic phosphorus with mol. wt > 10,000 indicated that the organic phosphorus was itself coloourless. Alkali-soluble concentrates were red-brown in colour and may have contained humic acids. Sufficient of the alkali-soluble organic phosphorus with mol. wt > 50,000 was isolated by precipitation on acidification for elemental analyses and infrared spectroscopy. Elemental analyses (45.9%, C, 6.6% H, 5.7% N, 0.6% P) showed that the composition of the precipitated material was not identical to the composition of soil humic acids being lower in carbon and higher in hydrogen, nitrogen and phosphorus. Infrared absorption spectra were, however, characteristic of humic substances. Phosphorus may be an integral part of the humic acid structure or an organic phosphorus-metal-organic matter complex may exist. Iron was present in the structure but the phosphorus to iron ratio was not constant between river samples. Algal bioassays on the acid-soluble organic phosphorus with mol. wt > 10,000 and the alkali-soluble organic phosphorus with mol. wt > 50,000 showed that 10 and 32% respectively were available for growth under the conditions of the test.

Some components of particulate phosphorus in river water entering Lough Neagh

Particulate phosphorus obtained by continuous-flow centrifugation of 1001, volumes of each of the 6 major rivers entering Lough Neagh was subjected to fractionation by acid and alkali treatments. The major acid-soluble component was inorganic phosphorus (36%) while the major alkali-soluble component was organic phosphorus (24%). The insoluble residue accounted for 36% of the total particulate phosphorus. Acid and alkali extracts were subjected to gel filtration chromatography and the organic phosphorus divided into molecular weight ranges. The alkali-soluble organic phosphorus of mol. wt > 50,000 was isolated in sufficient quantity for elemental analysis and infra-red spectroscopy to be performed. Results indicated that the organic matter resembled humic acid. Iron may also have been associated with the phosphorus and organic matter. Phosphorus may have been an integral part of the humic acid structure or an organic phosphorus iron organic matter complex may have existed. No algal availability studies were performed but the fractionation data from the study would not conflict with the suggestion of other workers that algal available particulate phosphorus is about 20% of total particulate phosphorus.

Determination of total nitrogen and phosphorus in river water and industrial wastewater by ion chromatography

Determination of total nitrogen and phosphorus in river water and industrial wastewater by ion chromatography

Determination of phosphorus in river water, sewer water and domestic waste water by inductively coupled plasma-optical emission spectrometry

P I 213.62nm(二次)について,近接線との重なりによる妨害,ストレーライトによる妨害を詳細に検討するとともに誘導結合高周波プラズマー発光分光分析法を河川水,下水,家庭排水中のリンの定量に適用し,良好な結果を得た.共存元素としての銅,鉄のスペクトル線との重なりによる妨害は実際試料では認められなかった.しかしアルゴン,NOのスペクトル線との重なりによる妨害は顕著であり,。しかもプラズマから放射されるアルゴンのスペクトル線はその波長がMIT波長表の記載値よりも長波長側にシフトしていることが分かった.しかしこれらの妨害は高周波電力,アルゴン流量,プラズマ内測光位置などのプラズマ作動条件を適正に設定することにより最小限に抑えることができた.又,バックグラウンドが検水中のマグネシウム濃度の増加につれて直線的に上昇し,これが河川感潮部で採取した河川水試料を分析した場合,大きな正の誤差を与える原因となった.従って,試料前処理段階で検水を陽イオン交換樹脂カラムに通し,マグネシウムをあらかじめ除去しておくことが必要であった.

Rate of availability of total phosphorus in river waters

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate of availability of total phosphorus in river watersF. H. Verhoff and M. R. HeffnerCite this: Environ. Sci. Technol. 1979, 13, 7, 844–849Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://doi.org/10.1021/es60155a011RIGHTS & PERMISSIONSArticle Views105Altmetric-Citations4LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (715 KB) Get e-Alerts Get e-Alerts