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Observations on the complexometric determination of calcium and magnesium in soil by means of EDTA.

, : Observations on the complexometric determination of calcium and magnesium in soil by means of EDTA.. Soil Sci. & Plant Nutr, 7: 82

After extracting with In KC1 and adding O.ln NaOH, Ca is determined by means of 0.01 n EDTA (pH 12) using murexide (murexide: K2SO4= 1: 30) and triethanolamine. In determining the sum of Ca and Mg, Fe and Mn are precipitated with freshly prepared (NH4)2S and if necessary filtered off. As the solution contains (NH4)2S, Eriochrome black T is resistant to oxidative decomposition by ferric-Fe or Mn and a sharp colour change from wine-red to blue marks the end point.


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Makar'iants, N.N.; Shmelev, E.I., 2013: New therapy schemes for acute, subacute and chronic variants of extrinsic allergic alveolitis. In order to improve treatment of patients with exogenous allergic alveolitis morphologically different variants of the disease, i.e. acute, subacute and chronic were identified and confirmed. For each variant of exogenous allergic alveolitis new t...

Bergstrom, I., 1938: Tetraploid apple seedlings obtained from the progeny of triploid varieties. In the successful attempt to raise tetraploid apples (Cf. Abst. 1311), 4, 000 open-pollinated seedlings were raised from the triploid varieties Belle de Boskoop and Blenheim. About 70 seedlings picked out at random were found to have somatic chrom...

Rao B.S.; Bai M.V.; Naseema K., 1990: A report on three cases of unilateral corneal ulceration and opacity in guinea piglets. Indian Veterinary Journal 67(6): 556-557

Pine, L.; Georg, L.K., 1969: Reclassiflcation of Actinomyces propionicus. Based on its production of propionic acid and the presence of diaminopimelic acid in its cell wall A. propionicus is placed in the new genus Arachnia under the name Arachnia prapionica.

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Harmer, Paul M., 1941: The muck soils of Michigan, their management and uses. Gives detailed information concerning muck soils of Michigan, including lime needs, fertilizers, amendments, moisture and drainage; soil prepn.; temp.; prevention of wind injury, and selection of crops adapted to growth on muck soils.

Schreiber, P.; Dessy, F.; Collard, F.; Knott, I.; Coppe, P.; Letesson, J.J., 1997: Nasotracheal bronchiolar lavage in non-sedated cattle for diagnosing bovine respiratory syncytial virus. Sixty-eight 77- to 279-day-old cattle, experimentally infected with bovine respiratory syncytial virus (BRSV) and twenty-five 27- to 172-day-old cattle with respiratory disease were used in this investigation. Fluid was collected from unsedated ca...

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Long, T., 1996: The future is now. How advances in dental technologies are changing the way you practice. Cds Review 89(7): 12-8, 20

Sugino, N., 1974: Diuretics--experimental and clinical studies. Nihon Rinsho. Japanese Journal of Clinical Medicine 32(8): 2577-2582