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| 02649cam 2200361za 4500 |
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| 001 | 9.849833 |
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| 003 | CaOODSP |
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| 005 | 20221107154018 |
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| 007 | cr ||||||||||| |
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| 008 | 180110s2007 onca|||fotb f000 0 eng d |
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| 040 | |aCaOODSP|beng |
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| 041 | |aeng|bfre |
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| 043 | |an-cn--- |
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| 086 | 1 |aEn83-9/07-541E-PDF |
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| 245 | 00|aToxicity of holmium-labelled clay to four benthic invertebrates |h[electronic resource] / |cLee Grapentine ... [et al.]. |
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| 260 | |a[Burlington, Ont.] : |b[Water Science and Technology Directorate, Environment Canada], |c2007. |
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| 300 | |aiii, 28 p. : |bill. (some col.) |
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| 490 | 1 |aWSTD contribution |vno. 07-541 |
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| 500 | |a"4 October 2007". |
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| 500 | |aDigitized edition from print [produced by Environment and Climate Change Canada]. |
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| 504 | |aIncludes bibliographic references. |
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| 520 | 3 |a"Montmorillonite clay adsorbed with the rare earth element holmium (Ha-clay) is a new material produced for tracing movements of fine particles in aquatic systems. However, little is known about the toxicity of Ha-clay, and its potential environmental effects. To investigate effects of Ha-clay on aquatic biota, four benthic invertebrate species (Chironomus riparius, Hexagenia spp., Hyalella azteca, Tubifex tubifex) were exposed to Ha-clay alone and mixtures of 10, 25 and 50% Ha-clay with field-collected reference sediment for 10-28 days in standard laboratory toxicity tests. Overall, only the 100% Ha-clay treatment resulted in significantly higher toxicity than the reference sediment. Mean survival at the end of the exposures to 100% Ha-clay was 7, 53, 2 and 100% for Chironomus, Hexagenia, Hyalella and Tubifex, respectively. Exposure to a negative control treatment of 100% clay resulted in minor reductions in growth, but no lethal responses. Highest concentrations of Ho at which no toxicity was observed were 1400 ug/g for sediment and 11 ug/L for water. Potential impacts of Ha-clay released into natural waters would be expected only where Ha-clay persists in sediment at proportions >50% for at least several days"--Abstract, p. ii. |
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| 546 | |aIncludes abstract in French. |
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| 692 | 07|2gccst|aWater management |
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| 692 | 07|2gccst|aWater quality |
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| 692 | 07|2gccst|aSediments |
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| 700 | 1 |aGrapentine, Lee C. |q(Lee Curtis), |d1961- |
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| 710 | 1 |aCanada. |bEnvironment Canada. |
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| 710 | 1 |aCanada. |bWater Science and Technology Directorate. |
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| 830 | #0|aWSTD contribution ;|vno. 07-541|w(CaOODSP)9.845900 |
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| 856 | 40|qPDF|s7.09 MB|uhttps://publications.gc.ca/collections/collection_2018/eccc/En83-9-07-541-eng.pdf |
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