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Measurement of soil pH part ii
- 1. Determination of Soil Reaction (pH) with the help of a pH Meter UG Geography Honours CBCS Syllabus Part of GEO-A-CC-4-10-P: Soil and Bio-Geography Lab: 30 marks, 2 Credits Study Material: Part II Dr. Sarada Mandal Associate professor in Geography Prabhu Jagatbandhu College Courtesy: Dr. Shrabani Som Majumdar, Former Scientist, IESWM
- 2. Implements required for Collection of Soil Sample Garden Spade Image from IndiaMART Image from : https://www.stepsystems.de/247-1- Edelman-augers.html Auger
- 3. Courtesy: Priya Kolay (Student of Prabhu Jagatbandhu College)
- 4. Estimated Budget for establishing a New Laboratory Sl. No Item Tentative Budget in Rupees as on April 2019 1 OVEN (ELECTRICAL) with Digital Microprocessor Temp. Controller including auto short circuits protection CHAMBER SIZE-15 x 15 x 18 inch 10000 to 15000/- 2 DIGITAL WEIGHING MACHINE 0.001 gm to 200 gm with imported semi magnetic lode cell CROWN GLASS WIND SHILD, auto cutup Adaptor, big display, S S PAN grade-304, leveling arrangement with stabilized voltage circuits fitted inside the Weighing machine. Around 10000/- 3 PORTABLE DIGITAL PH METER WITH ELECTRODE PH METER, Pocket Model*0 to 14 pH *Display: LCD, 13mm digit size. *Size: 131 x 70 x 25 mm Around 6000/- Market Price is liable to Change with time
- 5. Estimated Budget for a New Laboratory (Contd.) Sl. No Item Tentative Budget in Rupees as on April 2019 4 One packet of Whattman Filter paper, , 11cm diameter Around 1200 5, 6 Borosillicate Glass 250 ml Conical Flask, 250 ml Beaker Around 150, Around 100 7 Spatula (stainless Steel: 6 inches long: required for putting 5gm soil on Digital balance) Around 40 8, 9 Borosillicate Glass Measuring Cylinder 100ml, Same 50 ml Around 200, Around 100 10, 11 Borosillicate Glass Petri Dish with 3 inches diameter (Required for putting the soil in oven), Mortar and pestle Porcelain or wood with 4 inches Diameter Around 300 Around 100 12 Borosillicate Glass Funnel with 3 inches diameter (fitted to conical flask) Around 60 Market Price is liable to Change with time
- 6. Students have to write the following description during the experiment Determination of Soil pH With the help of a pH meter Principle • The soil pH reflects whether a soil is acidic, neutral, basic or alkaline. The acidity, neutrality or alkalinity of a soil is measured in terms of hydrogen ion activity of the soil water system. The negative logarithm of the H ion activity is called pH and thus pH of a soil is a measure of only the intensity of activity and not the amount of the acid present. The pH range normally found in soils varies from 3 to 9. Mathematically pH is represented as, log 1/H = - log H+
- 7. Apparatus: • Sample solution • pH Meter • Physical Balance • Oven • Beaker • Conical Flask • Measuring Cylinder • Petri dish • Filter Paper • Funnel • Mortar and pestle • Glass Rod.
- 8. Procedure: • The pH meter was calibrated using pH 7 buffer solution. • Then the meter was adjusted with known pH of buffer solutions 4.0 and 9.2. • 5.0 g of soil was weighed and transferred into 100 ml beaker. • 50 ml distilled water was added and stirred well with a glass rod. • This was allowed to stand for half an hour with intermittent stirring. • To the soil water suspension in the beaker, the electrode was immersed and pH value was determined from the automatic display of the pH meter.
- 9. Room Temperature should be noted down by a Thermometer Calculation Sample No. Temper ature in Degree Celsius Determin ed Value of pH Result Thus the pH of the given soil sample was ____________ and the given soil sample is __________ in nature