A.Sagaya Doss

Questions and Answers (13) View all

• Answer added in Odours
  18 On hitting dolomite with a hammer, it produces a typical pungent smell of H2S where as on powdering, it is not so? Is there any explanation?
  By Harshita Joshi · Wadia Institute of Himalayan Geology
  A.Sagaya Doss · Council of Agri Geo Environemntal Research

  Dear hit with a wooden hammer and see what smell generates ? please reply me i shall explain my mail id - dossbaba@gmail.com 

  Dear hit with a wooden hammer and see what smell generates ? please reply me i shall explain my mail id - dossbaba@gmail.com
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• Answer added in Clay
  3 Models for swell prediction in unsaturated clay soils?
  By Dennis Alazigha · University of Wollongong
  A.Sagaya Doss · Council of Agri Geo Environemntal Research

  First differentiate saturated and unsaturated clays - then the swelling and cation exchion capacity depends on the surface area, nature of the clay (o... [more]

  First differentiate saturated and unsaturated clays - then the swelling and cation exchion capacity depends on the surface area, nature of the clay (ordered or disordered shape) and the nature of ions which it can sorb or not - go to google scholar and download hundreds of publications.
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• Answer added in Wastewater Treatment
  14 Water is becoming dark black in Septic Tanks
  By Sivarajan Radhakrishnan · French Institute of Pondicherry
  A.Sagaya Doss · Council of Agri Geo Environemntal Research

  Dear Sarvarajan , Hi the answer that presented by Miss Rima Biswas, is the best for solution of your problem.my idea about your question is exactly th... [more]

  Dear Sarvarajan , Hi the answer that presented by Miss Rima Biswas, is the best for solution of your problem.my idea about your question is exactly the same as Miss Rima Biswas. thanks from Miss Rima
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• Answer added in Clay
  13 Does N2 physisorption analysis measure total surface area of clay mineral?
  By Antoine Tiya Djowe · Université Catholique de Louvain
  A.Sagaya Doss · Council of Agri Geo Environemntal Research

  Yes, you can determine the surface area of clays using N2 but if the material contains large number of micro pores, you will be measuring the micropor... [more]

  Yes, you can determine the surface area of clays using N2 but if the material contains large number of micro pores, you will be measuring the micropore volume equivalent of the surface area
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• Answer added in Clay
  7 Does anyone have a method for clay size fractionation beyond the 2 micron size other than the sedimentation method?
  By Arindam Sarkar · National Institute of Oceanography
  A.Sagaya Doss · Council of Agri Geo Environemntal Research

  Dear iam sending you the below procedure used for XRD analysis: http://www.xrayminerals.co.uk/services.html X-ray Mineral Services Ltd. 1 Claughton... [more]

  Dear iam sending you the below procedure used for XRD analysis: http://www.xrayminerals.co.uk/services.html X-ray Mineral Services Ltd. 1 Claughton Road, COLWYN BAY, LL29 7EF. UK Tel: +44 (0)1492 535250 Fax +44 (0)1492 536463 Services & Methods Whole Rock Quantification: The bulk sample is hand-crushed and divided as required for clay fraction analysis before grinding in a McCrone micronising mill. During grinding, the sample can be suspended in non-aqeous media as required, for example, when analysing evaporites or synthetic materials. The resulting powder is homogenised by hand grinding in an agate mortar before rear-packing into the mounting slide. Special mounts can be employed for small samples (down to 100mg) if required. Although the service is orientated towards geological samples, it is applicable to any crystalline material e.g. synthetic chemicals, scales or forensic samples. Typical sample size is >2g, although very small samples can be handled on special mounts for investigation. Clay Fraction Quantification: Separating the <2 micron fraction is achieved by ultrasound, shaking and centrifugation. Size fractions other than <2 micron (e.g. 2-16 micron) are obtained by varying the centrifuge speed and time. The total weight of clay extracted is determined by removing a 20ml aliquot of the final clay suspension and evaporating to dryness at 80°C. The clay XRD mount is obtained by filtering the clay suspension through a Millipore glass micro-fibre filter and drying the filtrate on the filter paper. The samples are analysed as an air-dried preparation, after saturation with ethylene glycol vapour overnight and following heating at 380°C for 2 hours and 550°C for one hour. The initial scan for these four treatments is between 3° and 35° 2theta at a step size of 0.05°/sec. The untreated sample is then analysed again over the range 24-27° 2theta with a step size of 0.02°/2 sec to refine adjacent kaolinite and chlorite peaks. X-ray Fluorescence (chemical) analysis: Major Elements: SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O, BaO, P2O5, SO3 and Cl. Samples are first dried (105°C) then crushed and ball-milled (agate) to a fine powder and mixed with a fixed proportion of lithium metaborate (or a mix including tetraborate depending on the sample matrix). This mixture is then fused at 1080°C for 15 minutes and cast into a 32mm diameter glass "bead". Loss on ignition (LOI) is calculated on a separate portion of the powdered sample. Trace Elements: V, Cr, Co, Ni, Cu, Zn, Ga, Ge, Se, Br, As, Rb, Sr, Y, Zr, Nb, Mo, Ag, Cd, In, Sn, Sb, I, Cs, Ba, La, Hf, Ta, W, Pb, Bi, Ce, Nd, Th, U. * Other elements may be possible depending upon the calibration of the measuring system. Approximately 10g of powdered sample is mixed with pva binder (Moviol) or wax and pressed at 20T using hardened steel anvils to produce a 32mm pressed powder pellet. The bead or pellet is measured using a Spectro X-Lab Energy Dispersive (polarised) XRF Spectrometer. The system is fully calibrated using international rock, soil, ore, sediment, ash, oil, plastics, and organic standards to ensure repeatable and accurate analysis. Hot-shot and Fast-track Service: Any of the above services can be accelerated upon payment of an agreed surcharge (25-100%) depending upon the turnround required - applicable only to small batches of samples.
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