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P compounds

Phosphorus compounds occur in wastewater under various forms, among which the reduced ones are predominant. The phosphorus compounds of wastewater concern not only some organic forms (natural or anthropic) but also orthophosphate ion and acid hydrolysable phosphate (condensed phosphate) (Fig. 10). [Pg.124]

Standard methods [2] used for the determination total phosphorus include several methods. Orthophosphates (PO and associated forms) are determined by colorimetry, ion chromatography or spectrophotometry (UV-visible). Acid hydrolysis allows the transformation of polyphosphates in orthophosphates, which are measured by one of the mentioned methods. Finally, a chemical digestion, followed by the determination of [Pg.124]

Some improvements have been proposed, such as the use of photo-oxidation as an alternative to chemical digestion, as it has been successfully used for similar applications [23-26], In order to minimise the photo-oxidation time, the UV light source (high-, medium- or low-pressure mercury lamp) can be associated with oxidants (hydrogen peroxide or potassium peroxodisulphate). Generally, the converted forms (orthophosphates) are determined by off-line analysis, but can also be measured by flow injection or sequential injection analysis [27,28]. [Pg.125]

In this section, a simple procedure, based on the use of a UV photo-oxidation module (previously described) and a UV-visible measurement, is presented [4]. Another procedure, based on the use of the alternative vanadomolybdophosphoric acid method with a UV-LED detection at 380 nm can also be envisaged [29]. [Pg.125]

As previously mentioned, phosphorus compounds are commonly classified into orthophosphates (PO ), acid-hydrolysable (condensed) phosphates and organic phosphates. It must be noticed that acid-hydrolysable phosphates (as pyrophosphates) are negligible in sewage [30], The general procedure illustrated in Fig. 11 includes two main steps an indirect UV-visible measurement (PO -) and a photo-oxidation step followed by a UV-visible measurement (Pgl)- First, orthophosphates are determined by spectrophotometric measurement of a phosphomolybdate complex (formed with addition of ammonium molybdate 40 gL-1) using the spectrum deconvolution method. [Pg.125]


Miscellaneous.- The planar 10-P-3 compound (162) forms a platinum complex (163) in which the ligand is bent (has the normal 8-P-3 94... [Pg.126]


See also in sourсe #XX -- [ Pg.66 , Pg.67 ]




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A,p-Unsaturated compounds

Acetylene-substituted Si-N-P compounds

Addition of compounds containing P-Cl bonds

Additions to a,P-unsaturated carbonyl compounds

Aldehydes, p-alkoxy reaction with allyl organometallic compounds

Alkylation of p-dicarbonyl compounds

Amides, p-ketoSubject organosamarium compounds

Ammonium compounds, p-iodophenyltrimethylSrnI reactions

By Addition of P—H to Unsaturated Compounds

By means of P-H compounds

By means of phosphites and other compounds containing P-H bonds

C-Glycosyl compounds P-bond cleavage

Carbonyl compounds a,p-unsaturated

Carbonyl compounds a-methyl-p-hydroxyconstruction

Carbonyl compounds a-unsubstituted-P-hydroxyconstruction

Carbonyl compounds via p-hydroxyalkyl selenides

Chelating a,p-Unsaturated Compounds

Classification and Nomenclature of P Compounds

Compounds of Aromatic Ring Systems E. O. Fischer and H. P. Fritz

Compounds of P, N and H Only

Compounds with Ge—O—P Linkages

Compounds with One- and Two-Connected P Atoms

Compounds with P-C-Metal Linkages

Compounds with P—O—B Linkages

Compounds with Si—O—P Linkages

Compounds with Sn—O—P Linkages

Compounds with Three-Connected P Atoms

Compounds with bonds to P, As or Sb

Compounds with s, p and f Block Elements

Cp2LnX compounds with P ligands

D.F.P. and related compounds

Deactivation of Oxidation Catalysts for VOC Abatement by Si and P Compounds

Enolates of a,p-Unsaturated Carbonyl Compounds

Enolates p-dicarbonyl compounds

Epoxidation of a,p-unsaturated carbonyl compounds

Epoxidations of a, p-Unsaturated Carbonyl Compounds

Esters, p-keto organosamarium compounds

Group 15 Element Compounds (N, P, As, Sb, Bi)

Henry reaction a,p-unsaturated carbonyl compounds

Heteronuclear Gold Cluster Compounds D. Michael, P. Mingos, and

Ketones, p-trimethylsilyloxy from silicon compounds

Layer structures p-block compounds

Metal Complexes of Cyclic P and C Compounds

Organo-Te-P, -As, -Sb, -Bi Compounds

Organometallic compounds of p-block elements

Organometallic compounds of s- and p-block elements

Other Methods of Preparing P-C Containing Compounds

Oxygen, liquid, caution microdetermination in P compounds, 8:215

P carbonyl compounds

P,y-Unsaturated carbonyl compounds

P-C compounds

P-Dicarbonyl compounds

P-Halide compounds

P-Hydroxycarbonyl compounds

P-Keto compound

P-Ketocarbonyl compounds

P-Lactam compounds

P-Lactones reaction with organocopper compounds

P-N compounds

P-Oxo compounds

P-Stereogenic Compounds Derived from Enantiopure Heterocycles

P-Substituted carbonyl compound

P-Unsaturated Carbonyl Compounds

P-alkoxy carbonyl compounds

P-amino carbonyl compounds

P-aminocarbonyl compounds

P-chiral compound

P-chiral hydroxy phosphoryl compounds

P-containing compounds

P-substituted aromatic compounds

PS II Compound Groups Today

Penta- and Hexacoordinated Si Compounds with Heavier Pnictogens (P)

Regioselectivity of a,p-unsaturated carbonyl compounds

Ring Compounds with P and

Ring Compounds with P, Se and C Atoms

Ring Compounds with P, Se and N Atoms

Selenides, p-hydroxyalkyl reactions with carbonyl compounds

Selenium dioxide a,P-unsaturated carbonyl compounds

Si-N-P compounds

Silanes, allenyl annulations reactions with a,p-unsaturated carbonyl compounds

Simple a,p-Unsaturated Compounds

Sulfoxide, methyl p-tolyl reactions with carbonyl compounds

Sulfoxides, allyl p-tolyl reactions with carbonyl compounds

Thio compounds a,p-unsaturated

TiSler, M., Kolar, P„ Amino Acids as Synthons for Heterocyclic Compounds

Trifluoroacetate Compounds of the s- and p-Block Elements

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