The Role of Clay Minerals in the Preservation of Organic Matter in Sediments of Qinghai Lake, NW China

2009 ◽  
Vol 57 (2) ◽  
pp. 213-226 ◽  
Author(s):  
Bingsong Yu ◽  
Hailiang Dong ◽  
Hongchen Jiang ◽  
Guo Lv ◽  
Dennis Eberl ◽  
...  
Keyword(s):  
Organic Matter ◽  
Clay Minerals ◽  
Qinghai Lake ◽  
Nw China

scholarly journals Role of Gypsum and Corn Cobs in Linkage of Peds in Cracking Soils

2018 ◽  
Vol 7 (1) ◽  
pp. 120-127
Author(s):  
S. K. Essa ◽  
Raid Shaalan Jarallah
Keyword(s):  
Organic Matter ◽  
Moisture Content ◽  
Clay Minerals ◽  
Control Sample ◽  
College Of Agriculture ◽  
Relative Moisture Content ◽  
X Ray ◽  
Corn Cobs ◽  
Relative Moisture

To study role of gypsum and corn cobs in linkage of fractions in cracking soils. Three soils (Al-Diwaniya , Al-Wihda and college of Agriculture / Abu Ghraib) were chosen for this study . They were  treated with two levels of gypsum (0.5 and 1) % with one level (4%) of corncobs . In this experiment , 2 kg of each studied soil were treated with same levels of corn cobs and gypsum above and incubated at 30 + 2 °C for 90 days and 80% relative moisture content at 33 kpa. And then the soils were sieved with 1 mm sieve to measured the x-ray diffractions . The results showed : The intensity of clay minerals peaks which treated with gypsum and corn cobs were decreased comparing with control sample. We believed that the gypsum should be facculated on clay minerals surfaces and mask them to appear clearly , and suggested that the gypsum was played an important role in conjugated of soil particles. Results of X-ray diffractions showed that there was no evidence of interaction between organic matter (corn cobs) and clay mineral inter layers.  

Particle Size Effects on Concentration of Metals in Lake Erie Bottom Sediments

1984 ◽  
Vol 19 (1) ◽  
pp. 27-36 ◽  
Author(s):  
Alena Mudroch
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Clay Minerals ◽  
Surface Sediment ◽  
Size Effects ◽  
Lake Erie ◽  
Size Fraction ◽  
Mineralogical Composition ◽  
Major Elements ◽  
Sediment Samples

Abstract Surface sediment samples obtained at the offshore and nearshore area of Lake Erie were separated into eight different size fractions ranging from <2 µm to 250 µm. The concentration of major elements (Si, Al, Ca, Mg, K, Na, Fe, Mn and P), metals (Zn, Cu, Cr, Ni, V, Co and Pb) and organic matter was determined together with the mineralogical composition and morphology of the particles in each size fraction. The distribution of the metals in the offshore sediment was bimodal with the majority of the metals divided between the 63 to 250 um size fraction which also contained the highest concentration of organic matter (about 20%) and the <4 µm fraction containing up to 60% of clay minerals. However, the metals in the nearshore sediment were associated mainly with the clay minerals.

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