Comparative Determination of Carbon, Nitrogen and Hydrogen in Environmental Standard Reference Materials by Instrumental Combustion Analysis and Thermal Neutron Capture Gamma-Ray Spectrometry

Schofield, T. G.; Gladney, Ernest S.; Miera, F.R.; Trujillo, P.E.

doi:10.1080/00032718008067942

Cited by 6 publications

(1 citation statement)

References 6 publications

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“…Most analytical methods for determining carbon in rock samples are based on the formation and liberation of C0 2 by acid decomposition, thermal decomposition or wet oxidation (Potts 1987, Johnson andMaxwell 1981), and determination of the C0 2 usually by gravimetric (Maxwell 1968), volumetric (Betelev and Kudachkin 1988), titrimetric (Riddle and Talerico 1978), coulometric (Chan 1986, Engleman andal. 1985), thermal conductimetric (Schofield and al. 1980) or infrared absorption spectrometric (Terashima 1988, Bouvier andAbbey 1980).…”

Section: Introductionmentioning

confidence: 99%

Determination of total and non-carbonate carbon in rock samples by a method using infrared absorption

Saikkonen¹,

Rautiainen²

1990

Bull Geol Soc Finland

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IRJA A., 1990: Determination of total and non-carbonate carbon in rock samples by a method using infrared absorption. Bull. Geo!. Soc. Finland 62, Part 2,[149][150][151][152][153][154][155][156] Total and non-carbonate carbon were determined by a method using infrared absorption in 20 international geological reference samples, 13 in-house reference samples and 13 other rock samples. For the determination of total carbon, C TOT , the samples were combusted at 1370°C in oxygen flow. Non-carbonate carbon, C NONC , was determined in a similar way but the samples were leached with hydrochloric acid to remove carbonate carbon before combusting. The concentration of carbonate carbon, C0 2 , was calculated from the difference C T0T -C NON c-The results (C T0T , C NONC and calculated C0 2 ) for the 20 international geological reference samples compared well with published data. The results (C XOT , C NONC and calculated C0 2 ) for the 13 in-house reference and 13 other rock samples agreed well with the results obtained by gravimetric methods. The precision of the used method was good: relative standard deviation was about 1%, 5% and 10% when the carbon content of the sample was 10%, 1% and 0.1% respectively. The effective detection limit was 0.01 -0.02% C.

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Section: Introductionmentioning

confidence: 99%

Determination of total and non-carbonate carbon in rock samples by a method using infrared absorption

Saikkonen¹,

Rautiainen²

1990

Bull Geol Soc Finland

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The influence of seed apparency, nutrient content and chemical defenses on dietary preference in Dipodomys ordii

Henderson

1990

Oecologia

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Physical, nutritional and defensive qualities of seeds differ in the extent to which they influence granivore preference. In a study aimed to quantifying those differences, Ord's kangaroo rats (Dipodomys ordii) were found to prefer the seeds of just three of twenty-nine species: Cryptantha crassisepala, Oryzopsis hymenoides and Salsola kali. Oryzopsis hymenoides was most preferred during the early plant growth season (April-July); preference for S. kali peaked during late (August-November) and dormant (December-March) seasons; and greatest preference for C. crassisepala occurred during dormant and early seasons. Regression of forage ratios, averaged across seasons, against seed length, mass, abundance, patchiness, percent nitrogen, energy content, and chemical defenses showed seed length to be the most important predictor of seed preference. Seed length combined with nitrogen (protein) content and levels of two defensive compounds, saponins and non-protein amino acids, to account for 68% of the variation in seed preference. The importance of seed length rather than biomass indicated that there are limits to the ability of D. ordii to detect small seeds and that small size facilitated escape of dispersed seeds. Seasonality in preference suggested, however, that seed escape was encountered by predispersal harvesting of newly maturing seeds still on plants. Maximization of protein intake contradicted previously published observations, but presumably reflected low nitrogen availability. In addition to small size, the presence of saponins or non-protein amino acids in seeds was sufficient to negate the positive influence of higher protein content.

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Multitechnique determination of elemental concentrations in NBS Urban Air Particulate SRM 1648 and evaluation of its use for quality assurance

Gladney

Perrin

Robinson

et al. 1984

Journal of Radioanalytical and Nuclear Chemistry, Articles

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Comparative Determination of Carbon, Nitrogen and Hydrogen in Environmental Standard Reference Materials by Instrumental Combustion Analysis and Thermal Neutron Capture Gamma-Ray Spectrometry

Cited by 6 publications

References 6 publications

Determination of total and non-carbonate carbon in rock samples by a method using infrared absorption

Determination of total and non-carbonate carbon in rock samples by a method using infrared absorption

The influence of seed apparency, nutrient content and chemical defenses on dietary preference in Dipodomys ordii

Multitechnique determination of elemental concentrations in NBS Urban Air Particulate SRM 1648 and evaluation of its use for quality assurance

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