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  • Calcium  (1)
  • Key words Reference materials  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Accreditation of reference material producers (1999)
    Springer
    Accreditation and quality assurance 4 (1999), S. 360-365 
    Details
    ISSN: 1432-0517
    Keywords: Key words Reference materials ; Accreditation ; Quality systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  The use of reference materials is the most pragmatic means by which the analyst can achieve comparability of data. Reference material producers therefore need to have adequate quality systems in place for ensuring the reliability of their materials. In order to provide guidance to both producers and assessors, ISO Guide 34 has recently been produced detailing the quality system requirements for the production of reference materials. CITAC, REMCO and ILAC are now collaborating in the revision of this guide to produce a free-standing document detailing the general requirements for the competence of reference material producers. This paper discusses some of the more important issues described in these documents. The possible formation of an international register containing details of a reference material producer's quality system status is also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007690050383
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Combined effects of nitrogen and elevated CO2 on soils from controlled environment studies (1995)
    Springer
    Water, air & soil pollution 85 (1995), S. 1551-1556 
    Details
    ISSN: 1573-2932
    Keywords: Nitrogen ; Carbon dioxide ; Phosphorus ; Calcium ; Potassium ; Magnesium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This paper describes the effects of elevated CO2 and N fertilization on soils planted with ponderosa pine (Pinus ponderosa) seedlings in short-term greenhouse studies. The high degree of homogeneity in the soils used allowed sensitive evaluation of soil changes in response to treatments. Elevated CO2 had no detectable effect upon soil N availability, but both CO2 and N fertilization caused significant changes in soil available (NH4F/HCl-extractable) P. Some of these changes could be accounted for by plant uptake, some were apparently due to differences in P immobilization (biotic or abiotic). N fertilization caused reductions in exchangeable K, Ca and Mg which could not be accounted for by plant uptake and were probably due to increased leaching. None of the reductions in soil available nutrients observed were of sufficient magnitude to cause nutrient deficiencies over the approximate 1-year duration of these studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00477201
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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