|
Registro Completo |
|
Biblioteca(s): |
Embrapa Solos. |
|
Data corrente: |
22/11/2002 |
|
Data da última atualização: |
22/11/2002 |
|
Autoria: |
REEUWIJK, L. P. van. |
|
Título: |
Laboratory methods and data exchange program for soil characterization: a report on the pilot round. Part I. CEC and texture. |
|
Ano de publicação: |
1984 |
|
Fonte/Imprenta: |
Wageningen: International Soil Reference and Information Centre, 1984. |
|
Páginas: |
43p. |
|
Série: |
(ISRIC. Technical Paper, 6). |
|
Idioma: |
Inglês |
|
Notas: |
Presented at the Fifth International Classification Workshop, Khartoum, Sudan, November 1982. |
|
Conteúdo: |
To gauge the need for possible standardization of analytical procedures used for soil characterization and classification, twenty laboratories from all over the world analyzed ten "reference" samples on particle size distribution and cation exchange capacity. The analytical results in general show a large variability both in accuracy and precision which are dependent on type of soil and laboratory. This strongly points to the need standardization of analytical procedures. The results also indicate that such standardization is feasible but that a certain, not insignificant level of variability will remain unavoidable. Such estimated levels are (relative figures): + 20% for CEC, +- 11% for clay determination and +- 25% for CEC of the clay. Consequently, classification criteria based on laboratory analysis should be used fexibly. |
|
Palavras-Chave: |
Analysis; Data processing; Laboratory methods; Sample description. |
|
Thesaurus Nal: |
classification; soil. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 01598nam a2200217 a 4500
001 1329784
005 2002-11-22
008 1984 bl uuuu u0uu1 u #d
100 1 $aREEUWIJK, L. P. van.
245 $aLaboratory methods and data exchange program for soil characterization$ba report on the pilot round. Part I. CEC and texture.
260 $aWageningen: International Soil Reference and Information Centre$c1984
300 $a43p.
490 $a(ISRIC. Technical Paper, 6).
500 $aPresented at the Fifth International Classification Workshop, Khartoum, Sudan, November 1982.
520 $aTo gauge the need for possible standardization of analytical procedures used for soil characterization and classification, twenty laboratories from all over the world analyzed ten "reference" samples on particle size distribution and cation exchange capacity. The analytical results in general show a large variability both in accuracy and precision which are dependent on type of soil and laboratory. This strongly points to the need standardization of analytical procedures. The results also indicate that such standardization is feasible but that a certain, not insignificant level of variability will remain unavoidable. Such estimated levels are (relative figures): + 20% for CEC, +- 11% for clay determination and +- 25% for CEC of the clay. Consequently, classification criteria based on laboratory analysis should be used fexibly.
650 $aclassification
650 $asoil
653 $aAnalysis
653 $aData processing
653 $aLaboratory methods
653 $aSample description
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Solos (CNPS) |
|
