What is soil recalcitrant?
 Compounds that are classified as recalcitrant or ‘stable’ are assumed to comprise a much greater proportion of the total soil carbon pool than those that are classified as labile.
Why is organic carbon bad?
The larger the carbon or organic content, the more oxygen is consumed. A high organic content means an increase in the growth of microorganisms which contribute to the depletion of oxygen supplies. The source of this organic material could be a wastewater treatment plant releasing treated sewage into the stream.
What is recalcitrant organic?
These new synthetic compounds that are slowly biodegradable or non-biodegradable are known as recalcitrant compounds, and range from simple halogenated hydrocarbons to complex polymers. Recalcitrant compounds can be oxygenated prior to degradation, in the presence of a readily assimilable carbon source.
What are recalcitrant organic pollutants?
Organic pollutants comprise a potential group of chemicals which can be dreadfully hazardous to human health. Many of these are recalcitrant. As they persist in the environment, they are capable of long range transportation, bioaccumulation, in human and animals, and biomagnifications in food chain (Nair et al., 2008).
What are the 4 main organic compounds?
The four types most important to human structure and function are carbohydrates, lipids, proteins, and nucleotides. Before exploring these compounds, you need to first understand the chemistry of carbon.
What is the difference between TOC and DOC?
TOC is measured at very different concentrations in a very wide range of systems. Dissolved organic carbon (DOC) is generally taken as that which will pass through a 0.45um filter. Large particle size TOC is classified as particulate or non-dissolved (NDOC).
How do you remove total organic carbon from drinking water?
There are a number of TOC methods for the removal or reduction of organic carbon, which include coagulation/flocculation, activated carbon, activated oxidation, ion exchange, reverse osmosis and nanofiltration. – Coagulation/Flocculation: is a chemical treatment used before sedimentation and filtration.
What is the most common meaning of recalcitrant?
obstinately defiant of authority or restraint
1 : obstinately defiant of authority or restraint. 2a : difficult to manage or operate. b : not responsive to treatment.
What is the difference between labile and recalcitrant carbon?
Labile carbon mainly consists of soil microbial biomass carbon, dissolved organic matter, and easily oxidative organic matter, whereas the recalcitrant carbon usually refers to the component of SOM that is resistant to microbial decomposition or protected by mineral soil particles (Fang et al. 2005; von Lützow et al. 2007 ).
What is the mineralized value of recalcitrant carbon?
The value of mineralized recalcitrant carbon varied from 18.48 mg C∙g − 1 SOC at 30 °C and 30% SMC for the mixed forest to 104.98 mg C∙g − 1 SOC at 15 °C and 90% SMC for the oak forest (Table 5).
How much recalcitrant carbon is found in oak forest?
Mineralized recalcitrant carbon varied from 18.48 mg C·g − 1 SOC at 30 °C and 30% SMC for the mixed forest to 104.98 mg C·g − 1 SOC at 15 °C and 90% SMC for the oak forest, and contributed at least 80% to total mineralized carbon.
Is the concept of recalcitrant an indeterminate abstraction?
In this concept paper I argue that recalcitrance is an indeterminate abstraction whose semantic vagueness encumbers research on terrestrial carbon cycling.