The Influence of Amendment to the Red Mud and the Effects of Rehabilitated Red Mud on Sweet Sorghum Seedlings

2014 ◽  
Vol 1073-1076 ◽  
pp. 216-221
Author(s):  
Chong Jian Ma ◽  
Ravi Naidu ◽  
Hui Ming

Red mud is the waste generated in alumina industry, which occupies much land and brings great harm to the ecological environment and its disposal and comprehensive utilization has become a major environmental concern of the whole society. This thesis discusses the rehabilitating effect of several amendments on red mud and their influences on the growth of the sorgo seedlings, eventually providing theoretical and technical support for in-situ remediation of the ecological environment red mud stacking area. The results show that the amendments could reduce pH value of the soil; the addition of phosphorus, gypsum and sludge can effectively reduce the pH value. All of these are beneficial to soil’s physical structure and seedling root. At the same time, sludge can provide necessary nutrients to seedlings while promote the metabolism. The research results have both theoretical significance and application prospect.

2006 ◽  
Vol 142 (3) ◽  
pp. 530-539 ◽  
Author(s):  
C.W. Gray ◽  
S.J. Dunham ◽  
P.G. Dennis ◽  
F.J. Zhao ◽  
S.P. McGrath

2001 ◽  
Author(s):  
Mark S. Dortch ◽  
Christian J. McGrath ◽  
John J. Nitao ◽  
Mark A. Widdowson ◽  
Steve Yabusaki

2001 ◽  
Author(s):  
Paul G. Tratnyek ◽  
Richard L. Johnson ◽  
Timothy L. Johnson ◽  
Rosemarie Miehr

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3682
Author(s):  
Katarína Vizárová ◽  
Izabela Vajová ◽  
Naďa Krivoňáková ◽  
Radko Tiňo ◽  
Zdenko Takáč ◽  
...  

The surface pH is a critical factor in the quality and longevity of materials and products. Traditional fast colorimetric pH detection-based tests such as water quality control or pregnancy tests, when results are determined by the naked eye, cannot provide quantitative values. Using standard pH papers, paper-printed comparison charts, or colorimetric microfluidic paper-based analytical devices is not suitable for such technological applications and quality management systems (QMSs) where the particular tested material should contain a suitable indicator in situ, in its structure, either before or after the process, the technology or the apparatus that are being tested. This paper describes a method based on the combination of impregnation of a tested material with a pH indicator in situ, its exposure to a process of technology whose impact on pH value is to be tested, colorimetric pH measurement, and approximation of pH value using derived pH characteristic parameters (pH-CPs) based on CIE orthogonal and cylindrical color variables. The hypotheses were experimentally verified using the methyl red pH indicator, impregnating the acid lignin-containing paper, and preparing a calibration sample set with pH in the range 4 to 12 using controlled alkalization. Based on the performed measurements and statistical evaluation, it can be concluded that the best pH-CPs with the highest regression parameters for pH are √∆E, ln (a),√∆H (ab), a/L, h/b and ln (b/a). The experimental results show that the presented method allows a good estimation of pH detection of the material surfaces.


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