1940
DOI: 10.1002/jpln.19400180302
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Humifizierung und Zersetzung und ihre Bestimmung in Torfen, Stallmisten und anderen organischen Bildungen .

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Cited by 29 publications
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“…Melin and Odén (1916) probably developed one of the first quantitative colorimetric approaches for the determination of the degree of peat humification, resulting in a relative value obtained by comparing the colour intensity of the alkali (NaOH) extract at boiling temperature of a sample with that of a standard preparation (Acidus huminicum, by Merck). This method was criticized by Springer (1940), who proposed the ratio, in %, between acetyl bromide insoluble C and total organic C or, in samples poor in ash, the ratio of insoluble organic material to the loss of ignition (LOI). Some of the oversimplifications of these methods were later overlooked by Kaila (1956) who used diluted sodium pyrophosphate (0.025 M) to extract, from 220 peat samples, in a semi-quantitative way, the dark-coloured products of decomposition; the colour intensity of filtered and diluted extracts was then measured using a colorimeter (with a monochromatic light filter having a transmission peak at 550 nm), resulting in the well-known pyrophosphate index.…”
Section: Determining the Degree Of Humification In Peat: An Historical Backgroundmentioning
confidence: 99%
“…Melin and Odén (1916) probably developed one of the first quantitative colorimetric approaches for the determination of the degree of peat humification, resulting in a relative value obtained by comparing the colour intensity of the alkali (NaOH) extract at boiling temperature of a sample with that of a standard preparation (Acidus huminicum, by Merck). This method was criticized by Springer (1940), who proposed the ratio, in %, between acetyl bromide insoluble C and total organic C or, in samples poor in ash, the ratio of insoluble organic material to the loss of ignition (LOI). Some of the oversimplifications of these methods were later overlooked by Kaila (1956) who used diluted sodium pyrophosphate (0.025 M) to extract, from 220 peat samples, in a semi-quantitative way, the dark-coloured products of decomposition; the colour intensity of filtered and diluted extracts was then measured using a colorimeter (with a monochromatic light filter having a transmission peak at 550 nm), resulting in the well-known pyrophosphate index.…”
Section: Determining the Degree Of Humification In Peat: An Historical Backgroundmentioning
confidence: 99%