DEVELOPMENT OF HUMASORBtm--A COAL DERIVED HUMIC ACID FOR REMOVAL OF METALS AND ORGANIC CONTAMINANTS FROM GROUNDWATER

Sanjay, H.G.; Fataftah, Amjad; Walia, D.S.; Srivastava, K. C.

doi:10.2172/765429

Cited by 3 publications

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“…More striking is the reductive cleavage of halogenated hydrocarbons. Substances like trichloroethylene (TCE), a very common pollutant in soils and ground water, are dehydrohalogenated to ethylene and HCl (43,44 ). This reduction corresponds to the reduction of TCE by elemental iron!…”

Section: Redox Properties Of Soil Humic Acidsmentioning

confidence: 99%

Humic Acids: Marvelous Products of Soil Chemistry

2001

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Humic acids (HAs) are remarkable brown to black products of soil chemistry that are essential for healthy and productive soils. Current HA models help to explain HAs' origins and behavior as flexible, aliphatic-aromatic, highly functionalized molecules that can act as photosensitizers, retain water, bind to clays, act as plant growth stimulants, and scavenge toxic pollutants. No synthetic material can match HAs' physical and chemical versatility. Removal of HAs from water avoids disinfection by-products such as chloroform and is a required step in production of potable water. HAs can bind soil toxins along with plant nutrients and they strongly stabilize soils. For these reasons more widespread HA production from composting and future applications of HAs extracted from coal will help to combat water and soil pollution, fight soil erosion, and lessen our dependence on chemical fertilizers.Featured on the Cover

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Section: Redox Properties Of Soil Humic Acidsmentioning

confidence: 99%

Humic Acids: Marvelous Products of Soil Chemistry

2001

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“…The higher amount of precipitates at 4% AMD at the 10 mg/L and 20 mg/L AHA levels, compared with the 3% AMD, is likely the result of HS forming precipitates because of the higher amounts of metals binding to the HS, as there are higher amounts of dissolved metals in the 4% AMD. Heavy metals bind to the carbon skeleton through heteroatoms, with the carboxylic and phenolic groups playing major parts by forming complex compounds with the heavy metals . At high metal‐to‐HS ratios, the colloid charge of HS becomes neutralized by complete saturation with metal ions; this causes the agglomeration of HS and metal ions, which then precipitate out of solution .…”

Section: Discussionmentioning

confidence: 99%

Influence of Aldrich humic acid and metal precipitates on survivorship of mayflies (Atalophlebiaspp.) to acid mine drainage

Holland

Duivenvoorden

Kinnear

2014

Enviro Toxic and Chemistry

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Humic substances (HS) have been shown to decrease the toxicity of environmental stressors, but knowledge of their ability to influence the toxicity of multiple stressors such as metal mixtures and low pH associated with acid mine drainage (AMD) is still limited. The present study investigated the ability of HS to decrease toxicity of AMD to mayflies (Atalophlebia spp.). The AMD was collected from the Mount Morgan (Mount Morgan, Queensland, Australia) open pit. Mayflies were exposed to concentrations of AMD at 0%, 1%, 2%, 3%, and 4% in the presence of 0 mg/L, 10 mg/L, and 20 mg/L Aldrich humic acid (AHA). A U-shaped response was noted in all AHA treatments, with higher rates of mortality recorded in the 2% and 3% dilutions compared with 4%. This result was linked with increased precipitates in the lower concentrations. A follow-up trial showed significantly higher concentrations of precipitates in the 2% and 3% AMD dilutions in the 0 mg/L AHA treatment and higher precipitates in the 2% AMD, 10 mg/L and 20 mg/L AHA, treatments. Humic substances were shown to significantly increase survival of mayflies exposed to AMD by up to 50% in the 20 mg/L AHA treatment. Humic substances may have led to increased survival after AMD exposure through its ability to influence animal physiology and complex heavy metals. These results are valuable in understanding the ability of HS to influence the toxicity of multiple stressors.

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“…The decrease in toxicity of heavy metals in the presence of dissolved organic carbon (DOC), such as HS, has been (2005) Dashes not tested a Dissolved metals b Total metals recorded (Chapman and Simpson [2005]) suggested to be due to the complexation of metals by DOC. Once in contact with HS, heavy metals are bound to the carbon skeleton through heteroatoms with the carboxylic and phenolic groups playing major parts by forming complex compounds with the heavy metals (Pehlivan and Arslan 2006;Sanjay et al 1995). This complexation with HS causes a shift in the speciation of different metals from a free/bioavailable form, such as Al 3?…”

Section: Discussionmentioning

confidence: 99%

Humic Substances Increase Survival of Freshwater Shrimp Caridina sp. D to Acid Mine Drainage

Holland

Duivenvoorden

Kinnear

2012

Arch Environ Contam Toxicol

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Humic substances (HS) are known to decrease the toxicity of heavy metals to aquatic organisms, and it has been suggested that they can provide buffering protection in low pH conditions. Despite this, little is known about the ability for HS to increase survival to acid mine drainage (AMD). In this study, the ability of HS to increase survival of the freshwater shrimp (Caridina sp. D sensu Page et al. in Biol Lett 1:139-142, 2005) to acid mine drainage was investigated using test waters collected from the Mount Morgan open pit in Central Queensland with the addition of Aldrich humic acid (AHA). The AMD water from the Mount Morgan open pit is highly acidic (pH 2.67) as well as contaminated with heavy metals (1780 mg/L aluminum, 101 mg/L copper [Cu], 173 mg/L manganese, 51.8 mg/L zinc [Zn], and 51.8 mg/L iron). Freshwater shrimp were exposed to dilutions in the range of 0.5 % to 5 % AMD water with and without the addition of 10 or 20 mg/L AHA. In the absence of HS, all shrimp died in the 2.5 % AMD treatment. In contrast, addition of HS increased survival in the 2.5 % AMD treatment by ≤66 % as well as significantly decreased the concentration of dissolved Cu, cobalt, cadmium, and Zn. The decreased toxicity of AMD in the presence of HS is likely to be due to complexation and precipitation of heavy metals with the HS; it is also possible that HS caused changes to the physiological condition of the shrimp, thus increasing their survival. These results are valuable in contributing to an improved understanding of potential role of HS in ameliorating the toxicity of AMD environments.

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DEVELOPMENT OF HUMASORBtm--A COAL DERIVED HUMIC ACID FOR REMOVAL OF METALS AND ORGANIC CONTAMINANTS FROM GROUNDWATER

Abstract: Portions of this document may be illegible in electronic image products. Images are produced from the best available original document.

Cited by 3 publications

References 0 publications

Humic Acids: Marvelous Products of Soil Chemistry

Humic Acids: Marvelous Products of Soil Chemistry

Influence of Aldrich humic acid and metal precipitates on survivorship of mayflies (Atalophlebiaspp.) to acid mine drainage

Humic Substances Increase Survival of Freshwater Shrimp Caridina sp. D to Acid Mine Drainage

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