Comparison of Two Wet Digestion Procedures for Multi‐element Analysis of Plant Samples

Oliva, Sabina Rossini; Raitio, Hannu; Mingorance, M.D.

doi:10.1081/css-120025216

Cited by 36 publications

(20 citation statements)

References 13 publications

(14 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Samples were analyzed with a Europa ANCA-GSL CN analyser (PDZ Europa Ltd, Sandbach, UK) following combustion at 1000 1C. Phosphorus concentration of finely ground oven-dried grain samples were measured using a Spectro-CCD (charge coupled device) ICP-AES unit (Spectro CIROS, Kleve, Germany) following a series of digestions with concentrated HNO 3 and H 2 O 2 at three temperatures: 120 1C for 4 h, 130 1C for 2 h and, finally, 145 1C until a white colored residue was obtained (Oliva et al, 2003).…”

Section: Measurementsmentioning

confidence: 99%

Nutrient constraints to tropical agroecosystem productivity in long‐term degrading soils

Ngoze

Riha

Lehmann

et al. 2008

Global Change Biology

View full text Add to dashboard Cite

Soil degradation is one of the most serious threats to sustainable crop production in many tropical agroecosystems where extensification rather than intensification of agriculture has occurred. In the highlands of western Kenya, we investigated soil nitrogen (N) and phosphorus (P) constraints to maize productivity across a cultivation chronosequence in which land-use history ranged from recent conversion from primary forest to 100 years in continuous cropping. Nutrient treatments included a range of N and P fertilizer rates applied separately and in combination. Maize productivity without fertilizer was used as a proxy measure for indigenous soil fertility (ISF). Soil pools of mineral nitrogen, strongly bound P and plant-available P decreased by 82%, 31% and 36%, and P adsorption capacity increased by 51% after 100 years of continuous cultivation. For the long rainy season (LR), grain yield without fertilizer declined rapidly as cultivation age increased from 0 to 25 years and then gradually declined to a yield of 1.6 Mg ha À1 , which was maintained as time under cultivation increased from 60 to 100 years. LR grain yield in the old conversions was only 24% of the average young conversion grain yield (6.4 Mg ha À1 ). Application of either N or P alone significantly increased grain yield in both the LR and short rainy (SR) seasons, but only application of 120 kg N ha À1 on the old conversion increased yield by 41 Mg ha À1 . In both SR and LR, there was a greater average yield increment response to N and P when applied together (ranging from 1 to 3.8 Mg ha À1 for the LR), with the greatest responses on the old conversions. The benefit-cost ratio (BCR) for applying 120 kg N ha À1 alone was o1 except on the old conversions, while BCRs were41 for applying 25 kg P ha À1 alone at all levels of conversion for both seasons. Application of both N (120 kg N ha À1 ) and P (25 kg P ha À1 ) on the old conversions resulted in the greatest BCRs. This study clearly indicates that maize productivity responses to N and P fertilizer are significantly affected by the age of cultivation and its influence on ISF, but that loss of productivity can be restored rapidly when these limiting nutrients are applied. Management strategies should consider ISF and economic factors to determine optimal N and P input requirements for achieving and sustaining profitable crop production on degraded soils.

show abstract

Section: Measurementsmentioning

confidence: 99%

Nutrient constraints to tropical agroecosystem productivity in long‐term degrading soils

Ngoze

Riha

Lehmann

et al. 2008

Global Change Biology

View full text Add to dashboard Cite

show abstract

“…At 30 and 60 days of experimental period, the plants were harvested and separated into aerial part and roots, washed with distillated water, and placed in paper bags in order to be dried in forced air stove at 65°C during 48 h. After drying, the plants were triturated and samples were weighed for foliar analyses. Plant samples were submitted to cooper determination conducted after nitric-perchloric digestion, according to Embrapa procedures (Embrapa, 1997), using a Inductively Coupled Plasma Optical Emission Spectroscopy (ICP OES), as described by Oliva et al (2003). The translocation index (TI) was determined by using the follow expression (Abicheque and Bohnen, 1998):…”

Section: Methodsmentioning

confidence: 99%

Bentonite application in the remediation of copper contaminated soil

Tito¹,

Chaves²,

Vasconcelos³

et al. 2016

Afr. J. Agric. Res.

View full text Add to dashboard Cite

The concern on heavy metals from commercial fertilizers for fertilization of crops when they are intended for human consumption has increased specifically, horticultures and grains. Several procedures have been proposed to reduce the concentration of heavy metals in the soil; among these are, the application of materials that are able to adsorb these elements, making them less available to plants. This study aimed to evaluate the bentonite for remediation of artificially copper contaminated soils, grown with beets, radish and corn. The experiment was conducted in a greenhouse in a completely randomized design, with four replicates. A loamy sand soil planted with radish and corn was contaminated with 100 mg kg . The copper content in the soil and in plants, as well as the translocation index in the plants was evaluated. The results were analyzed by the F test and polynomial regression was used for adjustment of significant data. Bentonite decreased the copper content in the dry phytomass of the plants, affected significantly the copper accumulated in the roots of beets and radish, and in the aerial part of radish. The copper translocation index in beets reduced with bentonite doses, and consequently the quantity of copper on beets was higher than those levels permitted for human consumption. Application of bentonite in contaminated soils grown with radish and corn improved their amelioration; on the other hand, the soil grown with beets did not present any amelioration.

show abstract

“…After drying, they were ground in a Willey type mill and packed in plastic bags. The wet digestion of plant samples was performed in open system, using adaptation of the method described by Oliva et al (2003). The concentrations of Cd, Cu, Fe, Mn, Pb and Zn in extracts of plant and soil were determined by inductively coupled plasma atomic emission spectroscopy (ICP-OES) (Miyazawa et al, 2009).…”

Section: Methodsmentioning

confidence: 99%

Availability of heavy metals in contaminated soil evidenced by chemical extractants

2012

View full text Add to dashboard Cite

RESUMO Disponibilidade de metais pesados a estratores químicos em solos contaminadosMetais pesados vêm se acumulando em solos brasileiros em razão de processos naturais, como deposições atmosféricas, ou atividades antropogênicas. Para alguns metais pesados, em condição de altas concentrações no solo, não existe um extrator especifico que avalie sua biodisponibilidade. Objetivou-se no presente trabalho, avaliar a biodisponibilidade dos elementos Cd, Cu, Fe, Mn, Pb e Zn para plantas de arroz e soja, utilizando diferentes extratores químicos. Neste estudo foram utilizadas sete amostras de solos com diferentes graus de contaminação, em delineamento experimental inteiramente casualizado, com quatro repetições. Foram determinados os teores disponíveis de Cd, Cu, Fe, Mn, Pb e Zn extraídos pelas soluções de Mehlich-1, HCl 0,1 mol L -1 , DTPA e ácidos orgânicos, e os teores desses elementos em plantas de arroz e soja, cujos extratos foram analisado por ICP-OES. Observou-se que os extratores Mehlich-1, HCl 0,1 mol L -1 e DTPA foram eficientes para avaliar a disponibilidade de Cd, Cu, Pb e Zn para plantas de arroz e soja. O mesmo não foi observado para os extratores derivados de ácidos orgânicos. Palavras Availability of heavy metals in contaminated soil evidenced by chemical extractantsHeavy metals have been accumulating in Brazilian soils, due to natural processes, such as atmospheric deposition, or human industrial activities. For certain heavy metals, when in high concentrations in the soil, there is no specific extractant to determine the availability of these elements in the soil. The objective of the present study was to evaluate the availability of Cd, Cu, Fe, Mn, Pb and Zn for rice and soybeans, using different chemical extractants. In this study we used seven soil samples with different levels of contamination, in completely randomized experimental design with four replications. We determined the available concentrations of Cd, Cu, Fe, Mn, Pb and Zn extracted by Mehlich-1, HCl 0.1 mol L -1 , DTPA, and organic acid extractants and the contents in rice and soybeans, which extracts were analyzed by ICP-OES. It was observed that Mehlich-1, HCl 0.1 mol L -1 and DTPA extractants were effective to assess the availability of Cd, Cu, Pb and Zn for rice and soybeans. However, the same was not observed for the organic acid extractant.

show abstract

Comparison of Two Wet Digestion Procedures for Multi‐element Analysis of Plant Samples

Cited by 36 publications

References 13 publications

Nutrient constraints to tropical agroecosystem productivity in long‐term degrading soils

Nutrient constraints to tropical agroecosystem productivity in long‐term degrading soils

Bentonite application in the remediation of copper contaminated soil

Availability of heavy metals in contaminated soil evidenced by chemical extractants

Contact Info

Product

Resources

About