Fontes de zinco e cobre de origem secundária: caracterização, solubilidade e disponibilidade à plantas de arroz

Moura, Thiago Augusto de

doi:10.11606/d.11.2010.tde-03082010-095033

Cited by 3 publications

(8 citation statements)

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“…In this work, brass slag I had an efficiency of 67 % and brass slag II of 27 % (Table 7), with different chemical compositions, oxide versus silicate (Table 3), respectively, which must have influenced the efficiency of these industrial by-products. These results were similar to those found by Moura (2010), who evaluated the agronomic efficiency of two brass slags and two fertilizers were prepared with pure oxides for analysis in rice plants. The author reported high efficiency (94 %) for Zn source in the form of oxide and bonded with the Cu forming a metallic alloy, containing 14.7 % SiO 2 and lower efficiency (42 %) for the other slag with Zn in the form of oxide and silicate, containing 44.7 % SiO 2 .…”

Section: Phase Ii: Availability Of Zn To Maize Plantssupporting

confidence: 89%

“…The Zn solubility in brass slag II, on the other hand, where the element is contained in the form of silicate (Table 3), was high only in the extractant solutions of 2% CA, 10 % SA and 10 % HCl, indicating that silicate-bound Zn is less soluble in the studied extractors. Differences in the mineralogical composition of brass slag with effects on the behavior of various extractors were reported by Moura (2010): in brass slag with 25.3 % Zn (total content) and 14.7 % SiO 2 , Zn was found in oxidized forms (ZnO), associated with Cu forming alloy (CuZn), as mineral gahnita (ZnAl 2 O 4 ) and willemite (Zn 2 SiO 4 ) with no statistical difference between Zn extraction by HCl, aqua regia, USEPA 3050 B modified by Moraes (2009), by 2 % CA and NAC and with lowest extraction by water. Another brass slag evaluated with 18 % Zn (total content) and 44.7 % SiO 2 contained Zn as oxide and silicate, however, Zn extraction decreased in the extractors aqua regia, HCl, 2 % CA, NAC, USEPA 3050 B adapted by Moraes (2009), and water.…”

Section: Levels Of Soluble Zn In 2 Nd Extractorsmentioning

confidence: 98%

“…A more recent study by Moura (2010) evaluated the extractors 2 % CA and NAC (both methods with stirring and boiling), and water to quantify the levels of available Zn in brass slag for rice plants grown in a clayey soil (Dark Red Latosol). The author reported that the 2 % CA extractor (under boiling) efficiently predicted the Zn available to rice plants in the industrial by-products, although the linear correlation coefficient (r) between the solubility of Zn content in the slags and Zn accumulated in plants was 0.47*.…”

Section: Evaluation Of 2 Nd Extractorsmentioning

confidence: 99%

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Extractants to assess zinc phytoavailability in mineral fertilizer and industrial by-products

Souza¹,

Abreu²,

Andrade

et al. 2013

Rev. Bras. Ciênc. Solo

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SUMMARYEfficient analytical methods for the quantification of plant-available Zn contained in mineral fertilizers and industrial by-products are fundamental for the control and marketing of these inputs. In this sense, there are some doubts on the part of the scientific community as well as of the fertilizer production sector, whether the extractor requested by the government (Normative Instruction No. 28, called 2 nd extractor), which is citric acid 2 % (2 % CA) (Brasil, 2007b), is effective in predicting the plant availability of Zn via mineral fertilizers and about the agronomic significance of the required minimal solubility of 60 % compared to the total content (HCl) (Brasil, 2007a). The purpose of this study was to evaluate the alternative extractors DTPA, EDTA, neutral ammonium citrate (NAC), buffer solution pH 6.0, 10 % HCl, 10 % sulfuric acid, 1 % acetic acid, water, and hot water to quantify the contents of Zn available for maize and compare them with indices of agronomic efficiency of fertilizers and industrial by-products when applied to dystrophic Clayey Red Latosol and Dystrophic Alic Red Yellow Latosol with medium texture. The rate of Zn applied to the soil was 5 mg kg -1 , using the sources zinc sulfate, commercial granular zinc, ash and galvanic sludge, ash and two brass slags. Most Zn was extracted from the sources by DTPA, 10 % HCl, NAC, 1% acetic acid, and 10 % sulfuric acid. Recovery by the extractors 2 % CA, EDTA, water, and hot water was low. The agronomic efficiency index was found to be high when using galvanic sludge (238 %) and commercial granular zinc (142 %) and lower with brass slag I and II (67 and 27 %, respectively). The sources galvanizing ash and brass ash showed solubility lower than 60 % in 2 % CA, despite agronomic efficiency indices of 78 and 125 %, respectively. The low agronomic efficiency index of (Brasil, 2007b) RESUMO: EXTRATORES PARA AVALIAÇÃO DA FITODISPONIBILIDADE DE ZINCO EM FERTILIZANTES MINERAIS E MATERIAIS SECUNDÁRIOS A utilização de métodos analíticos eficientes na quantificação do Zn fitodisponível contido em fertilizantes minerais e materiais secundários é fundamental no controle e na comercialização desses insumos. Nesse sentido, há dúvidas no setor científico e no de produção de fertilizantes se o extrator exigido na Instrução Normativa nº 28, ácido cítrico 2 % (AC 2 %)

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Section: Phase Ii: Availability Of Zn To Maize Plantssupporting

confidence: 89%

Section: Levels Of Soluble Zn In 2 Nd Extractorsmentioning

confidence: 98%

Section: Evaluation Of 2 Nd Extractorsmentioning

confidence: 99%

See 1 more Smart Citation

Extractants to assess zinc phytoavailability in mineral fertilizer and industrial by-products

Souza¹,

Abreu²,

Andrade

et al. 2013

Rev. Bras. Ciênc. Solo

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show abstract

“…At pH 2.3, the deprotonation of the three carboxyl groups from the molecules of citric acid, which is a condition for the release of oxygen as an electron donor group to the metal chelate, is more difficult (Alcarde and Ponchio, 1979), resulting in a complexing action of lower intensity in the 2 % CA solution than in NAC. Other authors also reported higher solubility of Cu sources in the NAC extractant compared to 2 % CA (Bastos et al, 2007a;Moura, 2010).…”

Section: Mineralogical Characterization Of Cu Sources and Extracted Cmentioning

confidence: 84%

“…Interestingly, the granulated Cu fertilizer did not reach the required minimum solubility (Table 4), although it is registered and authorized by MAPA for the market. This fertilizer contains Cu in the form of alloy (urusovite), carbonate (malachite and azurita) and sulfide (chalcopyrite) (Table 3), which are chemical forms known for their lower solubility (Bastos et al, 2007a;Moura, 2010).…”

Section: Mineralogical Characterization Of Cu Sources and Extracted Cmentioning

confidence: 99%

Phytoavailability of Copper in Industrial by-Products and Mineral Fertilizers

Souza

Abreu

Cunha³

et al. 2015

Rev. Bras. Ciênc. Solo

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Alternative copper (Cu) sources could be used in fertilizer production, although the bioavailability of copper in these materials is unknown. The objective of this study was to evaluate the extractants neutral ammonium citrate (NAC), 2 % citric acid, 1 % acetic acid, 10 % HCl, 10 % H 2 SO 4 , buffer solution pH 6.0, DTPA, EDTA, water, and hot water in the quantification of available Cu content in several sources, relating them to the relative agronomic efficiency (RAE) of wheat grown in a clayey Latossolo Vermelho eutrófico (Oxisol) and Neossolo Quartzarênico (Typic Quartzipsamment). Copper was applied at the rate of 1.5 mg kg -1 as scrap slag, brass slag, Cu ore, granulated copper, and copper sulfate. The extractants 10 % HCl, 10 % H 2 SO 4 , and NAC extracted higher Cu concentrations. The RAE values of brass slag and Cu ore were similar to or higher than those of Cu sulfate and granulated Cu. Solubility in the 2 nd NAC extractant, officially required for mineral fertilizers with Cu, was lower than 60 % for the scrap slag, Cu ore, and granulated copper sources. This fact indicates that adoption of the NAC extractant may be ineffective for industrial by-products, although no extractant was more efficient in predicting Cu availability for wheat fertilized with the Cu sources tested.

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Comparison of Analytical Methods for Quantifying the Levels of Lead, Cadmium, Chromium, and Nickel in Mineral Fertilizers and Industrial By-products

Souza

Abreu

Andrade

et al. 2014

Communications in Soil Science and Plant Analysis

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USEPA 3051a) were heated. Extraction without heating and stirring was employed in 10 percent HCl and 50 mmol L −1 DTPA methods. The Graybill's modified F-test, t-test for mean error, and the linear correlation coefficient analysis were used to compare test method performance. Equivalent results to USEPA 3051a were found with the following methods: DTPA for the extraction of lead in zinc sources and concentrated HCl and H 2 SO 4 for the extraction of cadmium and chromium in copper sources. However, the absolute values of cadmium, chromium, and nickel recovered by the use of H 2 SO 4 were greater regardless of the source. The greater extraction of contaminants in the evaluated methods suggests that there is need to review the official method if the aim is to quantify the total levels of these elements in raw materials and mineral fertilizers.

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Fontes de zinco e cobre de origem secundária: caracterização, solubilidade e disponibilidade à plantas de arroz

Cited by 3 publications

References 0 publications

Extractants to assess zinc phytoavailability in mineral fertilizer and industrial by-products

Extractants to assess zinc phytoavailability in mineral fertilizer and industrial by-products

Phytoavailability of Copper in Industrial by-Products and Mineral Fertilizers

Comparison of Analytical Methods for Quantifying the Levels of Lead, Cadmium, Chromium, and Nickel in Mineral Fertilizers and Industrial By-products

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