Chloride Interference in the Dichromate Oxidation of Soil Hydrolysates

Quinn, James G.; Salomon, Milton

doi:10.2136/sssaj1964.03615995002800030047x

Cited by 19 publications

(6 citation statements)

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“…This method was preferred over high temperature combustion method due to the presence of significant amounts of carbonates in the soils of sites L1 and L2, and to the similarity of the values obtained using the two methods in the other soils (Table ). Saline soil samples were treated with a silver sulphate solution to eliminate interference by chlorides during the analysis (Quinn and Salomon ). Microbial biomass C (MBC), using the chloroform‐fumigation extraction procedure described by Vance et al. () using a calibration factor of K c = 0.38 to correct the efficiency of the extractive process. Water‐soluble C (WSC), in 1:10 extracts obtained after 30 min of shaking, centrifugation at 1876 g and filtration through a nitrocellulose membrane filter with a pore size of 0.45 μ m (Ghani et al.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Interannual variations of soil organic carbon fractions in unmanaged volcanic soils (Canary Islands, Spain)

Armas-Herrera

Mora

Arbelo

et al. 2012

Ecology and Evolution

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The stability over time of the organic C stocked in soils under undisturbed ecosystems is poorly studied, despite being suitable for detecting changes related to climate fluctuations and global warming. Volcanic soils often show high organic C contents due to the stabilization of organic matter by short-range ordered minerals or Al-humus complexes. We investigated the dynamics of different organic C fractions in volcanic soils of protected natural ecosystems of the Canary Islands (Spain) to evaluate the stability of their C pools. The study was carried out in 10 plots, including both undisturbed and formerly disturbed ecosystems, over two annual periods. C inputs to (litterfall) and outputs from (respiration) the soil, root C stocks (0–30 cm), soil organic C (SOC) fractions belonging to C pools with different degrees of biogeochemical stability –total oxidisable C (TOC), microbial biomass C (MBC), water soluble C (WSC), hot-water extractable C (HWC), humic C (HSC), – and total soil N (TN) (at 0–15 and 15–30 cm) were measured seasonally.A statistically significant interannual increase in CO2 emissions and a decrease in the SOC, mainly at the expense of the most labile organic forms, were observed, while the root C stocks and litterfall inputs remained relatively constant over the study period. The observed changes may reflect an initial increase in SOC resulting from low soil respiration rates due to drought during the first year of study. The soils of nearly mature ecosystems were more apparently affected by C losses, while those undergoing the process of active natural regeneration exhibited disguised C loss because of the C sequestration trend that is characteristic of progressive ecological succession.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Interannual variations of soil organic carbon fractions in unmanaged volcanic soils (Canary Islands, Spain)

Armas-Herrera

Mora

Arbelo

et al. 2012

Ecology and Evolution

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“…Extracts from Kairanga soils contained various concentrations of C. However, Cl – interfered (Quinn & Saloman, 1964) during the dichromate digestion (for total C determination, Sparling et al ., 1991) of resin extracts from the Kairanga soils. A recovery of 99.5% C of a glucose spike was obtained for Cl – ‐free extracts.…”

Section: Methodsmentioning

confidence: 99%

Chemical fractionation to characterize changes in sulphur and carbon in soil caused by management

Bhupinderpal‐Singh

Hedley

Saggar

et al. 2003

European J Soil Science

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Summary Classical chemical fractionation of soil sulphur (S) into HI‐reducible S and carbon‐bonded S does not separate S in soil into fractions that have differing mineralization potentials. Other techniques are needed to separate organic S into more labile and less labile fractions of biological significance, irrespective of their bonding relations. We have sequentially fractionated soil S and carbon (C) into their ionic forms released onto ion‐exchange resins and organic S and C extracted in alkali of increasing concentration. We evaluated the technique on pasture and arable soils that had received various fertilizer and cultivation treatments. Total S and C were greater in the soil of the fertilized pasture than in that of the unfertilized pastures. Continuous arable cropping decreased total soil S and C, whereas restoration to pasture caused an accumulation. Resin, 0.1 m NaOH, 1 m NaOH and residual fractions accounted for between 1–13%, 49–69%, 4–16% and 19–38% of total soil S and between 5–6%, 38–48%, 5–7% and 46–53% of total soil C, respectively. Among different S and C fractions, the size of the 0.1 m NaOH and residual fractions changed more with the change in land use and management. The 0.1 m NaOH fraction had a narrower C:S ratio (50–75:1) than did the residual fraction (96–141:1). The significant degree of change in these two fractions, caused by differences in land management, indicates that they may be useful indicators of change in ‘soil quality’.

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“…A few grams of powdered mercuric oxide were added to each titration to complex the chloride ions (Quinn and Salomon 1964). The results of each determination were multiplied by 1.33 on the assumption that this method oxidizes about 75% of the organic carbon, as it does in terrestrial soils.…”

Section: Introductionmentioning

confidence: 99%

THE EFFECTS OF THE DEPOSIT FEEDING POLYCHAETE PECTINARIA GOULDII ON THE INTERTIDAL SEDIMENTS OF BARNSTABLE HARBOR1

Gordon

1966

Limnology & Oceanography

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Under laboratory conditions, individual Pectinaria gouldii worked 6 g of sediment/day. This rate was related directly to sediment temperature and inversely to sediment pigment concentration. At this rate, corrected for the effects of daily tidal exposure and annual temperature fluctuations, the worm population in the flat studied (10 worms/m2) would completely work all sediment in the 6‐cm thick surface layer every 15 years. The observed activity of other deposit feeders would substantially reduce this time. P. gouldii removed 3.55 units of sediment pigment (42%) and 1.43 mg of organic carbon (45%) from each gram of sediment worked, suggesting a rapid utilization of the available organic matter.

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Chloride Interference in the Dichromate Oxidation of Soil Hydrolysates

Cited by 19 publications

References 0 publications

Interannual variations of soil organic carbon fractions in unmanaged volcanic soils (Canary Islands, Spain)

Interannual variations of soil organic carbon fractions in unmanaged volcanic soils (Canary Islands, Spain)

Chemical fractionation to characterize changes in sulphur and carbon in soil caused by management

THE EFFECTS OF THE DEPOSIT FEEDING POLYCHAETE PECTINARIA GOULDII ON THE INTERTIDAL SEDIMENTS OF BARNSTABLE HARBOR1

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