+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

An investigation of the kinetic processes influencing mercury emissions from sand and soil samples of varying thickness

, : An investigation of the kinetic processes influencing mercury emissions from sand and soil samples of varying thickness. Journal of Environmental Quality 40(2): 647-652

Mercury flux from HgCl2 -treated sand and untreated soil samples of varying thickness (0.5-15 mm) were measured in dark and light under a Teflon dynamic flux chamber. Mean emissions over a 5.5-d sampling period showed an increase with depth for sand samples between 0.5 and 2 mm, but increasing depth above 2 mm had no effect. First-order kinetic models showed strong goodness of fit to the data and explained a high degree of variability in the emissions profile of all sand samples (R2 =0.70-0.98). Soil samples showed an initial emissions peak that was not correlated with depth, suggesting a very shallow process at work. However, longer-term "baseline" emissions, measured as mean emissions between Days 4.5 and 5.5, did show a relationship with depth. First-order kinetic models showed good fit for soil samples up to 4 mm thick (R2 =0.66-0.91); however, thicker samples did not show a consistent fit to first- or second-order kinetic models (1 degrees R2 =0.00-0.46; 2 degrees R2 =0.00-0.54). The data suggest that mercury emissions from soil samples may follow a multicomponent model for which more than one component is affected by incident radiation.


PMID: 21520771

Other references

Kullmann, D.M.; Asztely, F.; Walker, M.C., 2000: The role of mammalian ionotropic receptors in synaptic plasticity: LTP, LTD and epilepsy. Synaptic plasticity is the foremost candidate mechanism to explain the rapid acquisition of memories. In the mammalian brain, the NMDA subclass of glutamate receptors plays a central role in the induction of several forms of use-dependent plastici...

Hudson, N.Paul, 1942: Public health in wartime. The author urges that public health in wartime be "radical in law enforcement, active in the promotion of adult health, insistent in its services for children, and far-sighted in its plans for organized medical care.".

Babayev V.V.; Keleberda V.S.; Kovshikov A.O., 1997: Prospect of petroleum potential at northwestern part of Bakhmut Depression. Neftyanaya i Gazovaya Promyshlennost' (Kiev, 1960) 1997(6): 3-7

Johnson, P.N.; Rapp, R.P.; Nelson, C.T.; Butler, J.S.; Overman, S.; Kuhn, R.J., 2007: Characterization of community-acquired Staphylococcus aureus infections in children. BACKGROUND: Limited data exist concerning characteristics of community-acquired Staphylococcus aureus infections (CA-SAI) in central and eastern Kentucky.OBJECTIVE: To describe the incidence of community-acquired methicillin-resistant Staphylococc...

Guroff G.; Bromwell K.; Abramowitz A., 1969: Mode of action of para chloro phenyl alanine on pseudomonas species 11299a enz phenyl alanine hydroxylase. Archives of Biochemistry & Biophysics 131(2): 543-550

Garner, C.M.; Hubbold, L.M.; Chakraborti, P.R., 2001: Mycoplasma detection in cell cultures: a comparison of four methods. Mycoplasma is a common contaminant of tissue culture samples. Infection is persistent, difficult to detect and diagnose, and very difficult to cure. The concentration of mycoplasma in infected cultures can be as high as 10(7) colony-forming units...

Zeng, X.; Pan, S.; Li, J.; Wang, C.; Wen, Y.; Wu, H.; Wang, C.; Wu, C.; Feng, M., 2012: A novel dendrimer based on poly (L-glutamic acid) derivatives as an efficient and biocompatible gene delivery vector. Non-viral gene delivery systems based on cationic polymers have faced limitations related to their relative low gene transfer efficiency, cytotoxicity and system instability in vivo. In this paper, a flexible and pompon-like dendrimer composed of...

Imagawa, Y.; Okuyama, S.; Tsuchida, K.; Otomo, S., 1995: Effect of NE-100 on dizocilpine -induced hyperlocomotion in monoamine-depleted mice. Japanese Journal of Pharmacology 67(SUPPL 1): 146P

Földes, I., 1989: Correction of a regrettable error. Orvosi Hetilap 130(25): 1359-1359

Stein, A.D.; Wang, M.; Martorell, R.; Neufeld, L.M.; Flores-Ayala, R.; Rivera, J.A.; Ramakrishnan, U., 2011: Growth to age 18 months following prenatal supplementation with docosahexaenoic acid differs by maternal gravidity in Mexico. Little is known about the long-term effects of DHA intake during pregnancy. Offspring of primagravid Mexican women who received 400 mg/d DHA from wk 20 of gestation through delivery were heavier and had larger head circumferences at birth than chi...