Critical Coagulation Concentration of Paddy Soil Clays in Sodium–Ferrous Iron Electrolyte

2004 ◽  
Vol 68 (3) ◽  
pp. 789 ◽  
Author(s):  
Atinut Saejiew ◽  
Olivier Grunberger ◽  
Somsri Arunin ◽  
Fabienne Favre ◽  
Daniel Tessier ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Ferrous Iron ◽  
Critical Coagulation Concentration ◽  
Soil Clays

Critical Coagulation Concentration of Paddy Soil Clays in Sodium-Ferrous Iron Electrolyte

2004 ◽  
Vol 68 (3) ◽  
pp. 789-794 ◽  
Author(s):  
Atinut Saejiew ◽  
Olivier Grunberger ◽  
Somsri Arunin ◽  
Fabienne Favre ◽  
Daniel Tessier ◽  
...  
Keyword(s):  
Paddy Soil ◽  
Ferrous Iron ◽  
Critical Coagulation Concentration ◽  
Soil Clays

Fractionation method of ferrous iron in paddy soil

1969 ◽  
Vol 15 (1) ◽  
pp. 28-37 ◽  
Author(s):  
Satoru Motomura ◽  
Hajime Yokoi
Keyword(s):  
Paddy Soil ◽  
Ferrous Iron ◽  
Fractionation Method

scholarly journals Effects of Drying-Rewetting Cycles on Ferrous Iron-Involved Denitrification in Paddy Soils

Water ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3212
Author(s):  
Yushuai Zhang ◽  
Baokun Xu ◽  
Jiangpei Han ◽  
Liangsheng Shi
Keyword(s):  
Organic Carbon ◽  
Paddy Soil ◽  
Ferrous Iron ◽  
Ammonia Nitrogen ◽  
Paddy Soils ◽  
Jiangxi Province ◽  
Complex Interactions ◽  
Rapid Accumulation ◽  
Soil Moisture Status ◽  
Anaerobic Environment

Soil moisture status has an important effect on the process of denitrification in paddy soils. However, it is unclear how it affects the ferrous iron-involved denitrification. Here, the influence of drying-rewetting cycles on ferrous iron-involved denitrification in paddy soil were studied with batch experiments. The dynamics of nitrate, ammonia, Fe2+, Fe3+ and total organic carbon (TOC), as well as nitrous oxide (N2O) were investigated using the iron-rich paddy soil in Jiangxi province, South China. Results demonstrated that the denitrification rate dropped while ammonia nitrogen content (NH4+-N) showed a rapid accumulation in the drying period. In the rewetting period, organic carbon played two-side roles. Organic carbon and ferrous iron together provided electron donors to denitrification, and organic carbon simultaneously reduced ferric iron under anaerobic environment. There were complex interactions among organic carbon, nitrate and Fe2+/Fe3+ under drying-rewetting cycles. Soil rewetting led to denitrification flush, especially after a moderately long drying period, while excessively frequent drying-rewetting alternation was not favorable to nitrate denitrification.

PENDEKATAN EKSPLORASI RESERVOIR ONSHORE MELALUI PEMETAAN REMBESAN MIKRO HIDROKARBON DENGAN CITRA HIPERSPEKTRAL

2019 ◽  
Vol 3 ◽  
pp. 1181
Author(s):  
Muhamad Iqbal Januadi Putra
Keyword(s):  
Ferrous Iron

Kapabilitas citra satelit hiperspektral yang memiliki keunggulan spektral sangat berpotensi untuk dimanfaatkan dalam eksplorasi keberadaan reservoir onshore. Kemampuan ini dilakukan melalui perekaman spektral fenomena rembesan mikro hidrokarbon yang menimbulkan ekspresi anomali spektral tanah dan menjadi kunci keberadaan sumber hidrokarbon. Dalam penelitian ini, Sub-Cekungan Jatibarang dipilih sebagai wilayah penelitian. Berdasarkan teori spektral rembesan mikro hidrokarbon, citra Hyperion dapat digunakan sebagai alat untuk mendeteksi keberadaan fenomena rembesan mikro hidrokarbon sebagai penduga keberadaan reservoir onshore karena memiliki spektrum panjang gelombang yang peka terhadap objek anomali hidrokarbon. Sehingga, penelitian ini bertujuan untuk mendeteksi area rembesan mikro hidrokarbon dengan citra Hyperion di Cekungan Jatibarang. Hydrocarbon Index (HI) yang memanfaatkan saluran 155 (1.699 nm), 158 (1.729 nm), dan 160 (1.749 nm) digunakan sebagai algoritma untuk medeteksi area rembesan mikro hidrokarbon di Sub-Cekungan Jatibarang. Gejala anomali alterasi kaolinite, ferrous iron dan gejala anomali vegetasi dengan indeks NDVI digunakan sebagai pembanding akurasi HI. Hasil penelitian ini menunjukkan adanya sebaran rembesan mikro hidrokarbon di wilayah Kecamatan Tukdana (Indramayu), Kecamatan Pasekan (Indramayu), dan Kecamatan Ligung (Majalengka). Area sebaran rembesan mikro hidrokarbon teraglomerasi pada wilayah pesisir utara Kecamatan Pasekan. Secara umum, keberadaan rembesan mikro hidrokarbon berkorelasi dengan tingkat anomali alterasi kaolinite, ferrous iron, dan anomali vegetasi.

Synthesis and Breakdown of the Universal Precursors to Biological Metabolism Promoted by Ferrous Iron

2018 ◽  
Author(s):  
Kamila B. Muchowska ◽  
Sreejith Jayasree VARMA ◽  
Joseph Moran
Keyword(s):  
Amino Acids ◽  
Chemical Reaction ◽  
Metabolic Pathways ◽  
Ferrous Iron ◽  
Reaction Network ◽  
Tca Cycle ◽  
Chemical Reaction Network ◽  
Metabolic Precursors ◽  
Tca Cycle Intermediates

How core biological metabolism initiated and why it uses the intermediates, reactions and pathways that it does remains unclear. Life builds its molecules from CO<sub>2 </sub>and breaks them down to CO<sub>2 </sub>again through the intermediacy of just five metabolites that act as the hubs of biochemistry. Here, we describe a purely chemical reaction network promoted by Fe<sup>2+ </sup>in which aqueous pyruvate and glyoxylate, two products of abiotic CO<sub>2 </sub>reduction, build up nine of the eleven TCA cycle intermediates, including all five universal metabolic precursors. The intermediates simultaneously break down to CO<sub>2 </sub>in a life-like regime resembling biological anabolism and catabolism. Introduction of hydroxylamine and Fe<sup>0 </sup>produces four biological amino acids. The network significantly overlaps the TCA/rTCA and glyoxylate cycles and may represent a prebiotic precursor to these core metabolic pathways.

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