Ammonium Acetate Extractable Potassium

Let x ppm is the concentration of the test solution obtained from the standard curve. Suppose d times dilution was made (if the original extract is too much high in K ). Then extractant concentration = (xxd) ppm Now 10 ml solution contains (x xd) g of K+ 

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Calcium chloride Dimercury dichloride Hops (Humulus lupulus) extract Potassium acid tartrate Sodium succinate Sunflower (Helianthus annuus) seed oil Theobromine Theophylline Turpentine diuretic, chronic bladder problems Cubeb (Piper cubeba) oil diuretic, pharmaceuticals Ammonium acetate Hydrochlorothiazide Potassium acetate Sodium acetate anhydrous Trisodium citrate Urea... 

Two typical acid extractants are the Bray (which has two forms, both of which are acidic) and the Mehlich-3. The Bray extractant is a dilute solution of hydrochloric acid and ammonium fluoride [11], The Mehlich-3 extractant is a dilute solution of acetic and nitric acids and also contains ammonium nitrate and EDTA [11], Both are designed to extract soluble, exchangeable, and easily dissolved nutrients, particularly phosphate. While the Bray extractant is designed to extract plant available phosphorus, the Mehlich-3 extractant also extracts potassium [10-12],... 

A 2.000-g soil sample was analyzed for potassium content by extracting the potassium using 10.00 mL of aqueous ammonium acetate solution. Following the extraction, the soil was filtered and rinsed. The filtrate with rinsings was diluted to exactly 50.00 mL. Then 1.00 mL of this solution was diluted to 25.00 mL, and this dilution was tested with an instrument. The concentration in this 25.00 mL was found to be 3.18 ppm. What is the concentration of the potassium in the soil in parts per million ... 

Carbomethoxytropinone. A mixture of 1.35 g of sodium methoxide (this is sodium in a minimum amount of methanol), 3.5 g of tropinone, 4 ml of dimethylcarbonate and 10 ml of toluene is refluxed for 30 min. Cool to 0° and add 15 ml of water that contains 2.5 g of ammonium chloride. Extract the solution after shaking with four 50 ml portions of chloroform, dry, evaporate the chloroform in vacuo. Dissolve the oil residue in 100 ml of ether, wash twice with a mixture of 6 ml of saturated potassium carbonate and three ml of 3 N KOH. Dry and evaporate in vacuo to recover the unreacted tropinone. Take up the oil in a solution of aqueous ammonium chloride and extract with chloroform, dry, and evaporate in vacuo to get an oil. The oil is dissolved in hot acetone, cool, and scratch inside of flask with glass rod to precipitate 2-carbomethoxytropinone. Recrystallize 16 g of this product in 30 ml of hot methyl acetate and add 4 ml of cold water and 4 ml of acetone. Put in freezer for 2 /2 to 3 hours. Filter and wash the precipitate with cold methyl acetate to get pure product. 

Sometimes these operationally defined procedures have a sound theoretical basis. For example, it is quite reasonable to suppose that leaching with magnesium nitrate solution will displace zinc from cation exchange sites in soils, or leaching with ammonium acetate will displace exchangeable calcium, magnesium, sodium, and potassium. Flame spectrometry, especially flame AAS, is widely used for the analysis of such extracts. 

The extractable nickel content of soil affects the uptake of nickel by plant roots. Extracta-bility of nickel from soil is influenced by physical factors (e.g., texture, temperature, and water content), chemical factors (e.g., pH, organic constituents, redox potential), and biological factors (e.g., plant species variability, microbial activity) (NAS 1975, Wallace et al. 1977, Heale and Ormond 1982, Hazlett et al. 1983). Extractable nickel concentrations in soils, measured by treating soil samples with solutions of potassium chloride, ammonium acetate, acetic acid, or EDTA, usually range from <0.01 to... 

Satisfactory correlations between extractable heavy metals and pH for a variety of soils are notoriously poor. Thome et al, (233) found no consistent correlations for Utah soils between pH 3.2 acetic acid plus 0.05N potassium chloride extractable or total zinc with pH (or organic matter content). They concluded that total zinc differentiated zinc-deficient soils as well as the extraction procedure used. Brown et al, (38) observed no correlation between soil pH and either response to zinc application or ammonium acetate-dithizone extractable zinc. Kanehiro (129) did not find a satisfactory relation between soil pH and acid-extractable zinc however, if his samples which were more acid than pH 5.5 are ignored then there is a tendency for acid-extractable zinc to decrease with soil pH. Furthermore, if surface and subsurface samples are segregated the relationship is improved. This may be because of the presence of greater amounts of organic matter in the surface horizon samples hence, the hydrous oxides and their occluded metals were more soluble. 

The determination of CEC is commonly made by leaching a soil with a neutral barium acetate solution. It may also be made by extracting a soil with normal ammonium acetate solution, followed by normal potassium chloride. The ammonium removed by the potassium chloride is a measure of the CEC of the.-soil, which includes the cations held by both the organic and inorganic portions. Separate determinations of these portions can be made but less accurately because the separation of one from the other cannot be made without affecting the chemical nature of the organic colloid. 

A) A mixture of 333 parts of 4-(1 -piperazinyDphenol dihydrobromide, 11.2 parts of acetic acid anhydride, 42 parts of potassium carbonate and 300 parts of 1,4-dioxane is stirred and refluxed for 3 days. The reaction mixture is filtered and the filtrate is evaporated. The solid residue is stirred in water and sodium hydrogen carbonate is added. The whole is stirred for 30 minutes. The precipitated product is filtered off and dissolved in a diluted hydrochloric acid solution. The solution is extracted with trichloromethane. The acid aqueous phase is separated and neutralized with ammonium hydroxide. The product is filtered off and crystallized from ethanol, yielding 5.7 parts of 1 acetyl-4-(4-hydroxyphenyl)piperazine MP 181.3°C. 

Preparation of luciferase. Organisms were freeze-dried, powdered, and washed with ethyl acetate to destroy the majority of catalase activity. The washed residue was extracted with 50 mM potassium phosphate buffer, pH 6. The extract was fractionated by ammonium... 

C. (1S,2S,3R)-3-Hydroxy-2-nitrocyclohexyl acetate. A 500-mL flask equipped with a magnetic stirrer is charged with 10 g (41 mmol) of powdered nitrodiacetate and 300 mL of 0.2 M phosphate buffer of pH 7.0 prepared by dissolving 11 g of potassium dihydrogenphosphate and 3.3 g of potassium hydroxide in 300 mL of deionized (or distilled) water. To the stirred suspension is added 30 mg of purified PLE [Esterase (EC 3.1.1.1), suspended in 2.8 mL of 3.2 M ammonium sulfate buffer] (Note 6) and the mixture is stirred for 24 to 46 hr (Note 7). The continuously-measured pH drops to about 5.6 during the reaction and then remains almost constant, while the mixture has turned to a practically clear, pale yellow solution (Note 8). The solution is filtered through a paper filter and the filtrate is extracted three times with 10O mL ol ether. The... 

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