Arkaprava Roy

17 Questions 31 Answers 0 Followers

Questions related from Arkaprava Roy

In the presence of VERY high concentration (1000 ppm) of silicon, the adsorption isotherms of arsenic are showing anomalous trends, why so?

I conducted an adsorption experiment of arsenic on soil in the presence of different doses of silicon as competing ions to see the effect of silicon on arsenic adsorption and desorption. I took 5...

04 August 2024 6,462 3 View

Can Langmuir constant related to bonding energy (Kl) and Freundlich exponent (1/n) indicative of ads intensity show opposite trends with temperature?

The adsorbate is Arsenic and the adsorbent is a soil

19 July 2024 307 8 View

Does 0.2 (M) ammonium oxalate-oxalic acid (pH 3.25) reagent extract poorly crystalline Mn-oxides too?

Besides extracting the poorly crystalline Fe- and Al-(hydroxy)oxides, does 0.2 (M) ammonium oxalate-oxalic acid (pH 3.25) buffer extract poorly crystalline Mn-oxides too?

06 March 2024 4,819 2 View

Is it must for a soil solution (pore water) to maintain charge-balance or electro-neutrality even under chemical (high CEC) & physical constraints?

In the pore water of a long-cultivated paddy soil with high CEC (smectitic clay dominance), high organic matter and a clay pan (physical constraint) below 15 cm depth, can the total anion...

24 January 2024 9,988 2 View

How to artificially create increasing gradient of SOC in soil so that it's quality closely matches natural SOC after reaching equilibrium?

I want to artificially create soil organic carbon gradient in a soil by mixing externally applied organic matter for one of my pot-culture study. pH, SOC content and clay content of my soil are...

12 January 2024 9,729 5 View

How to calculate the carbon sequestration Potential of a soil?

How to calculate the carbon sequestration potential of soil? What are the parameters that are needed?

10 January 2024 5,211 1 View

Is there any comprehensive and holistic Crop Health Index that is NOT remote sensing-based (unlike NDVI)?

We have soil quality indices to judge the performance of soils concerning a certain management goal (yield of crops, in most cases). I was wondering, is there any comprehensive and holistic Crop...

09 January 2024 6,632 6 View

Where can I find the emission factors of different components of an educational institution for assessing the carbon footprint of that institute?

Is there any open-access source where I can find the emission factors for the Scope 3 components of an educational institution? The components include: chemical, glassware, capital goods,...

02 January 2024 6,737 5 View

Detailed outline for carbon auditing, energy auditing and water auditing of a research institute?

I need a detailed outline for doing 1. carbon auditing, 2. energy auditing, and 3. water auditing of a research institution/academic campus. Can somebody help me with the detailed outlines for...

01 January 2024 847 4 View

In an adsorption isotherm Kd value is changing with changing Co of the adsorbate. Which Kd value to consider for further thermodynamic calculations?

I want to calculate ∆G, ∆H and ∆S values for an adsorption isotherm using the following formulae: 1. Adsorption equilibrium constant (Kd) = qe/Ce where, qe=equilibrium adsorption capacity (mg/g)...

29 December 2023 7,688 12 View

How to interpret saturation index (SI) values?

How to interpret saturation index (SI) values for compounds in aqueous media if SI is 1. large negative 2. small negative 2. small positive (0-1), and 3. large positive (>1)? SI tells us about...

23 December 2023 3,419 0 View

What are the chemical compounds/forms of P associated with different fractions of inorganic phosphorus, especially the Residual-P fraction?

I assessed 6 fractions of total inorganic P namely, Saloid-P (1 N NH4Cl), Al-P (0.5 N NH4F), Fe-P (0.1 M NaOH), Occluded-P (0.1 M NaOH), Ca-P (0.5 N H2SO4) and Residual P (HF digestion) following...

08 December 2023 8,382 4 View

Need help in calculating saturation indices of some Arsenic-bearing minerals. Anybody working on arsenic geochemistry using PHREEQC or similar models?

Kindly let me know if anybody has expertise in the geochemical modeling of arsenic using PHREEQC or similar geochemical models. I need to calculate the saturation indices of some arsenic-bearing...

17 November 2023 6,613 2 View

How to interpret if adsorption increases with increasing temperature but the ∆H value is negative (i.e. the reaction is exothermic)?

A batch experiment was conducted to study the effect of temperature (20 and 35ºC) on the adsorption of arsenic on soil having high clay, organic matter and free iron. The adsorption increased with...

01 August 2023 222 6 View

What are the chemical compounds/forms of P associated with different fractions of inorganic phosphorus, especially the Residual-P fraction?

Can somebody please tell me what the chemical compounds or associations of P are that we extract in different steps of sequential extraction? I followed the procedure of Peterson and Corey (1966)...

01 January 1970 5,667 13 View

Rating of free Calcium carbonate in surface soil?

Is there any proposed or established rating of low, medium, and high calcium carbonate content in the surface soil? What is the minimum amount of calcium carbonate content that should be present...

01 January 1970 5,940 5 View

Detailed outline for carbon auditing, energy auditing and water auditing of a research institute.

I need a detailed outline for doing 1. carbon auditing, 2. energy auditing, and 3. water auditing of a research institution/academic campus. Can somebody help me with the detailed outlines for...

01 January 1970 3,057 0 View