Predicting the modifying effect of soils on arsenic phytotoxicity and phytoaccumulation using soil properties or soil extraction methods

2020 ◽  
Vol 263 ◽  
pp. 114501
Author(s):  
Xiaoqing Zhang ◽  
Elizabeth A. Dayton ◽  
Nicholas T. Basta
2019 ◽  
Vol 9 (17) ◽  
pp. 3514 ◽  
Author(s):  
Jenna Walsh ◽  
Joseph Sanford ◽  
Rebecca Larson

Biochar amendment to soil is a method used to mitigate losses of nitrogen leaching through agricultural soils. Multiple methods for extraction of nitrogen have been used, and recent studies have indicated that traditional soil extraction methods underestimate biochar nitrate. This study evaluated the nitrate extraction efficiency of a KCl extraction method under different temperature (20 and 50 °C) and duration (24 and 96 h) conditions. Increasing the duration of extraction from 24 to 96 h did not have a significant impact on extraction efficiency. However, increasing temperature resulted in nitrate extraction efficiencies above 90%. Rinsing the biochar once with deionized (DI) water following filtration after extraction increased the extraction efficiency significantly, but any subsequent rinses were not significant. This study recommends extracting nitrate from biochar using 2 M KCl at 50 °C for a period of 24 h with one additional rinse to increase nitrate recovery above 90%. However, future studies should evaluate this procedure for different types of biochar produced from alternative biomasses and at varying temperatures.


2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Yao-Tsung Chang ◽  
Zeng-Yei Hseu ◽  
Franz Zehetner

This study compared the extractability of Cd, Cu, Ni, Pb, and Zn by 8 extraction protocols for 22 representative rural soils in Taiwan and correlated the extractable amounts of the metals with their uptake by Chinese cabbage for developing an empirical model to predict metal phytoavailability based on soil properties. Chemical agents in these protocols included dilute acids, neutral salts, and chelating agents, in addition to water and the Rhizon soil solution sampler. The highest concentrations of extractable metals were observed in the HCl extraction and the lowest in the Rhizon sampling method. The linear correlation coefficients between extractable metals in soil pools and metals in shoots were higher than those in roots. Correlations between extractable metal concentrations and soil properties were variable; soil pH, clay content, total metal content, and extractable metal concentration were considered together to simulate their combined effects on crop uptake by an empirical model. This combination improved the correlations to different extents for different extraction methods, particularly for Pb, for which the extractable amounts with any extraction protocol did not correlate with crop uptake by simple correlation analysis.


2013 ◽  
Vol 16 (2) ◽  
pp. 93-98 ◽  
Author(s):  
Irnanda Aiko Fifi Djuuna ◽  
Lynette Abbott ◽  
Craig Russell

Soil chemical, physical and biological analyses are a crucial but often expensive and time-consuming step in the characterization of soils. Rapid and accurate predictions and relatively simple methods are ideally needed for soil analysis. The objective of this study was to predict some soil properties (e.g. pH, EC, total C, total N,C/N, NH4-N, NO3-N, P, K, clay, silt, and sand and soil microbial biomass carbon) across the Wickepin farm during summer season using a Mid-Infra Red - Partial Least Square (MIR–PLS) method. The 291 soil samples were analyzed bothwith soil extraction procedure and MIR Spectrometer. Calibrations were developed between MIR spectral data and the results of soil extraction procedures. Results using the PLS-MIR showed that MIR-predicted values were almost as highly correlated to the measured value obtained by the soil extraction method of total carbon, total nitrogen and soil pH. Values for EC, NH4-N, NO3-N, C/N, P, K, clay, silt, sand, and soil microbial biomass carbon were not successfully predicted by the MIR – PLS technique. There was a tendency for these factors to correlate with the MIR predicted value, but the correlation values were very low. This study has confirmed that the MIR-PLS method can be used to predict some soil properties based on calibrations of MIR values.Keywords: MIR-Partial Least Square, MIR-Spectroscopy, soil properties


2019 ◽  
Vol 23 (2) ◽  
pp. 86-94
Author(s):  
Rosi Rosidah ◽  
Rina Devnita ◽  
Ridha Hudaya ◽  
Rachmat Haryanto

This study was aimed at determining the effect of steel slag micro particles on Phosphorus (p), p-available retention and interchangeable Hydrogen (h-dd) on Andisol. The material used in this study was Andisol and steel slag. The Andisol was obtained from PTPN VIII-Ciater tea plantations (1250 m asl) on the eastern slope of Tangkuban Perahu Mountain, Subang, West Java. The steps taken were soil sampling using disturbed soil extraction methods using Minipit technique, soil sample filtering, weighing, mixing soil samples with steel slag from PT Krakatau Steel Serang, refining done using the Top-Down method, incubating and then analyzing properties soil chemistry. The chemical properties of the soil analyzed were P, P-available and H-dd retention. P retention was analyzed by the Blackmore method, P-available was analyzed using the Bray I, Bray II, and Olsen methods. H-dd was analyzed by the Titration method. The data obtained were then carried out statistical tests with variance analysis (ANOVA) with RAL environmental design and Duncan test. The results showed that the micro-application of steel slag particles had an effect on available P and P retention but had no affect on H-dd.PENGARUH PARTIKEL MIKRO TERAK BAJA TERHADAP RETENSI FOSFOR DAN HIDROGEN PADA ANDISOLPenelitian ini bertujuan untuk mengetahui pengaruh partikel mikro terak baja terhadap retensi Fosfor (p), p-tersedia dan Hidrogen dapat dipertukarkan (H-dd) pada Andisol. Bahan yang digunakan dalam penelitian ini adalah andisol dan terak baja. Andisol didapat dari perkebunan teh PTPN VIII-Ciater (1250 m dpl) pada lereng bagian timur Gunung Tangkuban Perahu, Subang, Jawa Barat. Tahapan yang dilakukan adalah pengambilan sampel tanah menggunakan metode pengambilan tanah terganggu dengan teknik minipit, penyaringan sample tanah, penimbangan, pencampuran sampel tanah dengan terak baja yang berasal dari PT Krakatau Steel Serang, penghalusan yang dilakukan dengan metode Top-Down, penginkubasian dan kemudian penganalisaan sifat kimia tanah. Sifat kimia tanah yang dianalisi adalah retensi P, P-tersedia dan H-dd. Retensi P dianalisis dengan metode Blackmore, P-tersedia dianalisis menggunakan metode Bray I, Bray II, dan Olsen. H-dd dianalisi dengan metode titrasi. Data yang didapat selanjutnya dilakukan uji statistik dengan analisis sidik ragam (Anova) dengan rancangan lingkungan RAL dan uji Duncan. Hasil penelitian menunjukkan bahwa Aplikasi mikro partikel terak baja berpengaruh terhadap retetnsi P dan P-tersedia tetapi tidak berpengaruh terhadap H-dd.


2019 ◽  
Vol 432 ◽  
pp. 895-901 ◽  
Author(s):  
Julian Fäth ◽  
Michael Kohlpaintner ◽  
Uwe Blum ◽  
Axel Göttlein ◽  
Karl H. Mellert

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2480
Author(s):  
Wan Muhammad Ikram Wan Mohd Zamri ◽  
Fridelina Sjahrir ◽  
Nor Suhaila Yaacob ◽  
Noor Fazreen Dzulkafli ◽  
Mohd Fadzli Ahmad ◽  
...  

The assessment of water-extractable organic matter using an autoclave can provide useful information on physical, chemical, and biological changes within the soil. The present study used virgin forest soils from Chini Forest Reserve, Langkawi Island, and Kenyir Forest Reserve (Malaysia), extracted using different extraction methods. The dissolved organic carbon (DOC), total dissolved nitrogen (TDN), total dissolved phosphorus (TDP), and ammonium-nitrate content were higher in the autoclave treatments, up to 3.0, 1.3, 1.2, and 1.4 times more than by natural extraction (extracted for 24 h at room temperature). Overall, the highest extractable DOC, TDN, TDP, ammonium and nitrate could be seen under autoclaved conditions 121 °C 2×, up to 146.74 mg C/L, 8.97 mg N/L, 0.23 mg P/L, 5.43 mg N mg/L and 3.47 N mg/L, respectively. The soil extracts became slightly acidic with a higher temperature and longer duration. Similar trends were observed in the humic and nonhumic substances, where different types of soil extract treatments influenced the concentrations of the fractions. Different soil extraction methods can provide further details, thus widening the application of soil extracts, especially in microbes.


2019 ◽  
Vol 20 (1) ◽  
pp. 113-128 ◽  
Author(s):  
R. R. P. Noble ◽  
I. C. Lau ◽  
R. R. Anand ◽  
G. T. Pinchand

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