{"refrec":{"BRefID":13039,"RR":"<b>Struys, J.</b> (1976). De uraan koncentratie in de Noordzee, Waddenzee en IJsselmeer en in het mondingsgebied van Rijn en Maas. <i>NIOZ-rapport</i>, 1976(3). NIOZ: Texel. 18 pp.","BEntID":13039,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>NIOZ-rapport</i>, 1976(3). NIOZ: Texel.  18 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Struys, J.","OrigTitleTranslFlag":1,"Authorstringtrunc":"Struys, J.","Englishabstract":"Dissolved uranium was determined colorimetrically with Arsenazo-III at pH1 after separation and concentration with Dowex A1 in the presence of CyDTA as a masking agent. The yield was 100% and the reproducability about 0.3ppb. The average concentrations, range and number of observations were, in ppb:Rhine: April and June: 0,9 (0,6-1,7;11)IJsselmeer: August: 1,2 (1,2-1,3;3)North Sea, S. Bight: April and June: 3,5 (2,5-5,1; 25)Wadden Sea: July and September: 3,2 ( 2,9-3,5; 19)The values for the Rhine and the IJssel lake are relatively high, this is possibly related to the high use of phosphate fertilizers in the catchment area. The values for North Sea and Wadden Sea are not significantly different from the oceanic average of 3,3 ppb. There is no linear relationship between dissolved Ur and salinity in the Rhine estuary. On the shallow Balgzand tidal flats the water at low tide contained 0,6 ppb U less than in the adjacent tidal inlet. Possibly the anoxic sediments in this region concentrate a detectable amount of dissolved U from the overlying seawaterRhine","AbstractOtherLang":"Opgelost uranium werd colorimetrisch met Arsenazo-III bij pH1 na isolering en koncentrering met Dowex A1 en CyDTA als maskeringsreagens. De opbrengst was 100% en de reproduceerbaarheid ongeveer 0,3 ppb. De gemiddelde koncentraties, de range in ppb en het aantal waarnemingen waren:Rijn: April en Juni: 0,9 (0,6-1,7;11)IJsselmeer: Augustus: 1,2 (1,2-1,3;3)Noordzee, Z. Bocht: April en Juni: 3,5 (2,5-5,1; 25)Waddenzee: Juli en september: 3,2 ( 2,9-3,5; 19)De waarden voor de Rijn en voor het IJsselmeer zijn vrij hoog; mogelijk heeft dit te maken met de hoge gift aan fosfaat-kunstmest in het stroomgebied. De waarden voor de Noordzee en de Waddenzee zijn niet significant verschillend van het oceanische gemiddelde van 3,3ppb. Er is geen lineair verband tussen opgelost uranium en zoutgehalte in het Rijn-estuarium. Het water dat bij laag water op het Balgzand achterblijft bevat 0,6ppb Ur minder dan het water in het Marsdiep. Mogelijk concentreren de gereduceerde sedimenten in dit gebied de detecteerbare hoeveelheid uranium uit het bovenstaande zeewater.","BibLvlCode":"MS","StandardTitle":"De uraan koncentratie in de Noordzee, Waddenzee en IJsselmeer en in het mondingsgebied van Rijn en Maas","OrigTitleLangCode":"nl","OrigTitleLangCodeExtended":"dut","OrigTitleLangID":41,"DateLastModified":{"date":"2025-07-24 01:33:38.639748","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1976,"DateUpdate":"2025-07-17","DateCreate":"2001-07-09","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":13039,"ISBN":null,"PubliDate":1976,"IssueDate":null,"Volume":"1976","Issue":"3","Pagination":"18","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5697,"SerRR":"NIOZ-rapport. 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