{"refrec":{"BRefID":13049,"RR":"<b>Jager, J.E.</b> (1975). Amorf gesuspendeerd en reactief silicaat in de zuidelijke Noordzee gedurende de periode van 2 september tot 3 november 1973. <i>NIOZ-rapport</i>, 1975(10). Nederlands Instituut voor Onderzoek der Zee: Texel. 20 pp.","BEntID":13049,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>NIOZ-rapport</i>, 1975(10). Nederlands Instituut voor Onderzoek der Zee: Texel.  20 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Jager, J.E.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Jager, J.E.","Englishabstract":"A method has been developed to determine amorphous suspended silica in seawater using the following principle. Reactive silicate concentration is determined by the method of Strickland and Parsons (1968). Then diluted hydrogen fluoride is added to a final concentration of 0,49% (W/W) at T=0. Very rapidly at T=1, 2, 3 minutes and at T= 1, 2, 3, 4, 5, 6 hours subsamples are taken and the reactive silicate concentrations are determined by a somewhat different Strickland and Parsons method. The molybdate reagent contains boric acid in order to complex excess fluoride and to decompose silico-fluoride complexes. The obtained values of the concentrations are plotted against time and from this curve three silica containing fractions which react with fluoride at a different rate are determined.","AbstractOtherLang":"Het silicaat in gesuspendeerd materiaal werd geanalyseerd met een oplosmethode, waarbij verdund HF gebruikt wordt. In een monster wordt reactief silicaat bepaald met de methode van Strickland and Parsons (1968). Daarna wordt verdunde HF toegevoegd tot een eindconcentratie van 0,49% (W/W) en geroerd. Dit HF zet gesuspenderde silicaten om in oplosbare silicofluoriden. Na 1,2 en 3 minuten na toevoeging van HF en na 2, 3, 4, 5 en 6 uur wordt een submonster genomen, waaraan boorzuur wordt toegevoegd wat de overmaat HF complexeert en onstane silicofluoride complexen afbreekt tot H<sub>4</sub>SiO<sub>4</sub> wat daarna volgens Strickland en Parsons wordt bepaald.","BibLvlCode":"MS","StandardTitle":"Amorf gesuspendeerd en reactief silicaat in de zuidelijke Noordzee gedurende de periode van 2 september tot 3 november 1973","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2025-07-22 01:33:06.175990","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1975,"DateUpdate":"2025-07-15","DateCreate":"2001-07-09","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":13049,"ISBN":null,"PubliDate":1975,"IssueDate":null,"Volume":"1975","Issue":"10","Pagination":"20","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5697,"SerRR":"NIOZ-rapport. 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