User manual HANNA INSTRUMENTS HI 38084

[. . . ] ­ Even for smaller areas, 2 samples are recommended (the more samples, the better the end-results, because the end sample is more representative). ­ For a small garden or plot, 1 sample is sufficient. 2) Avoid extracting samples from soil presenting obvious anomalies and from border areas (near ditches and roads). [. . . ] · Flip open the top of the Demineralizer Bottle cap. By gently squeezing the bottle, add dem50 mL ineralized water to the large (50 mL) test tube up to the 50 mL mark. · Add 2 measures of the large (2 g) sample cup of Potassium Chloride (add full cups and discard the excess soil by using the spoon handle). www. hannainst. com Dear Customer, Thank you for choosing a Hanna Product. Please read the instruction sheet carefully before using the test kit. It will provide you with the necessary information for correct use of the kit. If you need additional information, do not hesitate to e-mail us at tech@hannainst. com. Remove the chemical test kit from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any noticeable damage, notify your Dealer or the nearest Hanna office immediately. Each kit is supplied with: · Potassium Chloride, 1 box (380 g); · Phenolphthalein Indicator, 1 bottle with dropper (20 mL); · HI 38084C-0 Titration Solution, 1 bottle (120 mL); · Demineralizer Bottle with filter cap for about 12 liters of deionized water (depending on the hardness level of water to be treated); · 1 2-mm soil sieve; · 1 large funnel; · filter paper discs 120 mm (100 pcs); · 1 plastic test tube (50 mL) with screw cap; · 1 calibrated plastic vessel (50 mL); · 2 sample cups (2 g); · 1 sample cup (1 g); SIGNIFICANCE AND USE The total exchangeable acidity (TEA) is a measure of the amount of acidic cations (hydrogen, aluminum, iron and manganese) present in soil. It is expressed in milliequivalent per 100 grams (meq/100 g) of soil. The more acidic it is a soil, the lower the soil pH value will be. Soils in humid regions normally accumulate increasing amounts of exchangeable acidity as they get older. Soil acidity may develop toxicity that can damage or kill plants. x2 CHEMICAL REACTION The extraction method is the potassium chloride method. The acidic cations are firstly leached from the soil and then titrated with a standard alkali. [. . . ] DETERMINATION OF THE TOTAL EXCHANGEABLE ACIDITY · Add 4 drops of Phenolphthalein Indicator to the extract and swirl to mix. REFERENCES APHA, AWWA, WEF, Standard Methods, 20th edition, 1998. Sequi, Chimica del suolo, Patron Editore, Ed. 1991. HEALTH AND SAFETY The chemicals contained in this kit may be hazardous if improperly handled. [. . . ]