User manual HANNA INSTRUMENTS HI 38082

[. . . ] Instruction Manual SPECIFICATIONS Range 0 to 50 mg/L (ppm) as K 50 to 250 mg/L (ppm) as K Smallest Increment 5 mg/L [in the 0-50 mg/L range] 25 mg/L [in the 50-250 mg/L range] Analysis Method Turbidimetric Sample Size 3 mL and 0. 6 mL Number of Tests 100 Case Dimensions 235x175x115 mm (9. 2x6. 9x4. 5") Shipping Weight 889. 0 g (31. 3 oz. ) times). Add deionized water up to the 25 mL mark. HI 38082 Potassium Test Kit for Soil 3- Add 18 drops of Formaldehyde Solution and swirl to mix. 25 mL x18 SIGNIFICANCE AND USE www. hannainst. com Dear Customer, Thank you for choosing a Hanna Product. [. . . ] In addition, potassium makes plants more resistant to diseases and yields a positive effect on the color and fragrance in flowers. The problem of lack of potassium is quite frequent in calcareous soils. Note: mg/L is equivalent to ppm (parts per million). 4- Using the short plastic pipette, add 3 mL of HI 38082A-0 Alkaline Solution and swirl to mix. 8- Hold the tube close to the Graduated card as shown in the figure. 9- Read directly from the Graduated card the concentration in mg/L (ppm) of potassium that corresponds to the level of the liquid in the test tube. 3 mL CHEMICAL REACTION The Hanna Test Kit determines Potassium in soil via a turbidimetric method. Potassium is precipitated in a basic environment with sodium tetraphenylborate. The developed turbidity is proportional to potassium concentration. 5- Add 1 packet of HI 38082B-0 reagent and mix by means of the spoon. 6- Wait for 5 minutes to allow reaction to complete. If Potassium is present, the solution will become turbid. 7- Place the test tube on the Point card and look from the top of the tube at the black spot on the Point card. Use the long pipette to fill the tube with the reacted sample until the black spot completely disappears. 10- In case the black spot on the Point card disappears when the liquid level is under the 50 ppm mark, the potassium concentration is higher than 50 ppm. Dilute the original sample and perform the test as follows. 11- Using the syringe, add to the plastic vessel 0. 6 mL of soil extract. [. . . ] POTASSIUM CONVERSION TABLE mg/L lbs/A Kg/A meq/100g 10 20 22 0. 026 15 30 33 0. 038 20 40 45 0. 051 25 50 56 0. 064 30 60 67 0. 076 35 70 78 0. 090 40 80 89 0. 100 45 90 100 0. 120 50 100 112 0. 130 75 150 167 0. 190 100 200 223 0. 260 125 250 279 0. 320 150 300 334 0. 380 175 350 390 0. 450 200 400 446 0. 510 225 450 502 0. 580 250 500 558 0. 640 Note: meq/100 g is milliequivalent per 100 grams. REFERENCES Adaptation of the Turbidimetric Tetraphenylborate Method. HEALTH AND SAFETY The chemicals contained in this kit may be hazardous if improperly handled. Read the relevant Health and Safety Data Sheet before performing this test. [. . . ]