Condicionadores químicos de solo e retenção e distribuição de cádmio, zinco e cobre em latossolos tratados com biossólido

Silveira, Maria L.; Alleoni, Luís Reynaldo Ferracciú; Chang, Andrew C.

doi:10.1590/s0100-06832008000300017

Cited by 14 publications

(9 citation statements)

References 26 publications

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“…The metals were determined in each fraction by atomic absorption spectrophotometry with graphite furnace (Model Spectraa 220, Varian), and the index was calculated coating used as a criterion for control of the results the maximum tolerable error equal to ± 20%, and: Recovery (%) = (S metal contents in the fractions / total content) x 100. The degree of recovery (100 ± 20%) was used as a criterion of quality control analyzes (Silveira et al, 2008). Total concentrations were determined according to EPA Method 3052 with microwave digestion with HNO 3 + HF + ultrapure water (EPA, 1996).…”

Section: Maintenance Of the Test Organismsmentioning

confidence: 99%

Use of artificial sediment to assess toxicity of chromium on Chironomus xanthus, Danio rerio and Poecilia reticulata

et al. 2013

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AIM: Artificial sediments with simple formulations were used to assess the toxicity of Cr to C. xanthus, D. rerio and P. reticulata. METHODS: The organisms were exposed to two sediment formulations: one without organic matter (S0) and one with 1% organic matter (SIII), both contaminated with Cr at concentrations of 90, 180, 360, 720 and 1440 mg/kg for the assays with C. xanthus, and 375, 750, 1500 and 3000 mg/kg for those with the two fish species. Chromium was obtained from the potassium dichromate (K2Cr2O7). RESULTS: The results of the acute toxicity tests demonstrated a reduction of up to four times in toxicity with the presence of OM, consisting of biodegradable detritus, even at the low concentration used (1%), and that C. xanthus was most sensitive to the metal. The reduction in the chromium toxicity was indicated by the LC50 values, which were higher in SIII (1234.43 mg/kg; 2263.54 m/kg; 2244.48 mg/kg) than in S0 (340.56 mg/kg; 1731.04 mg/kg; 1733.55 mg/kg) for C. xanthus, D. rerio and P. reticulata, respectively. CONCLUSIONS: Because of the repeatability of the results obtained, the artificial sediments with simple formulations were satisfactory to assess toxicity and can thus provide reliable results in ecotoxicological studies

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Section: Maintenance Of the Test Organismsmentioning

confidence: 99%

Use of artificial sediment to assess toxicity of chromium on Chironomus xanthus, Danio rerio and Poecilia reticulata

et al. 2013

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“…In this context, several procedures have been proposed to reduce the mobility and bioavailability of heavy metals: microorganisms (bioremediation), plants (phytoremediation) or soil conditioners (lime, soluble sources of P, Fe and Mn and clay materials) (Silveira et al, 2008). The use of adsorbent surfaces, such as clay minerals (specifically bentonite) has been studied (Rodrigues et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Phytomass of beans and grain production as affected by zinc, copper and cadmium doses and bentonite application

Tito

Chaves

Guerra

et al. 2011

Rev. bras. eng. agríc. ambient.

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The objective of this study was to determine the effect of zinc, copper and cadmium on phytomass and grain production and to evaluate indirectly the adsorbent effect of bentonite clay by determining the accumulation of these heavy metals in bean plants. The study consisted of three separate experiments (one for each cation) with the application of three doses of bentonite (0, 30 and 60 t ha -1 ) in pots containing separately 50 mg of Zn; Cu and Cd kg -1 of soil, with three replicates. Thus, each experiment consisted of 9 experimental units. In each one, a bean plant was cultivated and after 65 days, samples of leaves, stems, roots and grains were collected. Afterwards, the samples were dried, weighed, grinded and the concentrations of Zn, Cu and Cd were determined. The phytomass of leaves of the plant growing on the soil with Zn, the Zn concentration in the whole plant and the Cd concentration in the leaves, stem and grains were significantly influenced by the bentonite application. Zn and Cd concentration in leaves, stem and grains decreased with the application of bentonite, indicating a positive effect of the clay application to the soil on the adsorption of these metals, decreasing the availability for plants. Zn was the most accumulated element in the plant, followed by Cd and Cu. The Zn, Cu and Cd accumulation in the plant obeyed the following sequence: stem > leaves > grains > roots; roots > stem > grains > leaves; roots > stem > leaves > grains, respectively.Key words: heavy metal, clay, Vigna unguiculata L.Fitomassa e produção do feijão afetadas pelas doses de zinco, cobre e cádmio e aplicação de bentonita RESUMO Objetivou-se, com este trabalho, estudar o efeito do cobre, zinco e cádmio em fitomassa e produção de grãos e avaliar indiretamente o efeito adsorvente da argila bentonita, determinando o acúmulo de metais pesados em plantas de feijão. O estudo consistiu de três experimentos separados (um para cada cátion), com a aplicação de três doses de bentonita (0, 30 e 60 t ha -1 ) em vasos contendo, separadamente, 50 mg de Zn, 50 mg de Cu e 50 mg de Cd kg -1 de solo, com três repetições. Assim, cada experimento consistiu de nove unidades experimentais e em cada uma delas se cultivou uma planta; aos 65 dias após o plantio, colheramse folhas, caules, raízes e grãos que, depois de secos, pesados e moídos, foram analisados para Zn, Cu e Cd. A fitomassa das folhas das plantas cultivadas no solo com Zn, a concentração de Zn na planta inteira e a concentração de Cd nas folhas, caule e grãos foram significativamente influenciados pela aplicação de bentonita. As concentrações de Zn e Cd nas folhas, caule e grãos, diminuíram com a aplicação de bentonita indicando efeito positivo da aplicação de argila no solo sobre a adsorção desses metais, diminuindo a disponibilidade para as plantas. Zn foi o elemento que mais se acumulou nas plantas, seguido pelo Cd e Cu. O acúmulo de Zn, Cu e Cd na planta obedeceu a seguinte sequência: caule > folha > grãos > raiz; raiz > caule > grãos > folha; raiz > caule > folha > g...

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“…óxidos, hidróxidos e oxihidróxidos de Fe e Al, principalmente). Outros autores, realizando extrações sequenciais, observaram que a fração mineral é a mais significativa na adsorção de Zn (Silveira et al, 2008;Girotto et al, 2010). A média de adsorção de Zn foi maior em sistema isolado que em competitivo, indicando o efeito supressor do Cu em relação ao Zn.…”

Section: Resultsunclassified

Adsorção de Cu e Zn num Latossolo Vermelho tratado com dejetos suínos

et al. 2014

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Cu and Zn adsorption in an Oxisol treated with pig slurryCooper and zinc derived from pig slurry can accumulate in the soil, posing risks to human and animal health. The objective of this study was to determine the adsorption capacity and the competition of Cu and Zn in Oxisols that received continued applications of 200 m 3 ha -1 year -1 of pig slurry for seven years and to compare with soil under natural conditions. To evaluate the adsorption, Cu and Zn solutions were applied to the soil at concentrations of 0, 25, 50, 100, 150, 200, 400, 1.200 µmol L -1 ; soil:solution ratio of 1:100.Merck Certipur standard solution 1.000 mg L -1 was utilized to construct the levels of Zn and Cu. The adsorption of Cu showed a sigmoid behavior (S-type isotherm) in soil with no slurry application and linear behavior (C-type isotherm) in soil with pig slurry. The maximum adsorption of Cu in soil without pig slurry was 3,021 mg kg -1. For Zn, all the isotherms showed linear behavior. The maximum adsorption capacity of Cu and Zn was not reached in soil with slurry. These results show that the studied Oxisol has a high capacity to retain Zn and Cu from pig slurry.

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Condicionadores químicos de solo e retenção e distribuição de cádmio, zinco e cobre em latossolos tratados com biossólido

Cited by 14 publications

References 26 publications

Use of artificial sediment to assess toxicity of chromium on Chironomus xanthus, Danio rerio and Poecilia reticulata

Use of artificial sediment to assess toxicity of chromium on Chironomus xanthus, Danio rerio and Poecilia reticulata

Phytomass of beans and grain production as affected by zinc, copper and cadmium doses and bentonite application

Adsorção de Cu e Zn num Latossolo Vermelho tratado com dejetos suínos

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