Nitric acid stock solution

A common method for the electrodeposition of Am is from isopropanol solutions containing small quantities of dilute acid stock solutions of Am ions. Aqueous deposition methods have also been employed, but the organic electrolyte medium is more advantageous in that it tends to produce more uniform coatings [151[. Zhi etal. prepared relatively thick targets of Am from a mixture of isopropanol and dilute (0.1 N) nitric acid stock solutions pf [152]. The electrolysis... 

If you had to prepare 20. mL of your own 3 M nitric acid, HNO3, solution from 4 mL of stock concentrated 15 HNO3, why would you add the concentrated HNO3 to water rather than vice versa ... 

For Method A, a 4.75-mmol/L solution of mercuric nitrate. Prepare a mercuric nitrate stock solution by first dissolving 5.14 g Hg(N03)2-H20 (WARNING EXTREMELY TOXIC) in 5 mL of 50 % (vol/vol) nitric acid. After solute has completely dissolved, make up to 150 mL with Type II water. Stock solution = 0.100 mol/L. Prepare 4.75 mmol/L solution by putting 47.5 mL of stock solution... 

Reagents. Standard copper (II) solutions. Dissolve 100 mg of spectroscopically pure copper metal in a slight excess of nitric acid and dilute to 1 L in a graduated flask with de-ionised water. Pipette a 10 mL aliquot into a 100 mL graduated flask and make up to the mark with acetone (analytical grade) the resultant solution contains 10 g of copper per mL. Use this stock solution to... 

Pre-acidified pore water (100 pi, diluted with Millipore Q-water if necessary) was transferred, using an Eppendorf pipette, into a 10 ml volumetric Pyrex flask. To this flask nitric acid (50 pi) was added, and the solution was then brought to volume with Millipore Q-water. Standards were made up by adding various amounts to stock metal solutions (lmg/1), nitric acid (50 pi), and a seawater solution (100 pi) of approximately the same salinity as the samples to be analysed. This final addition ensures that the standards are of approximately the same ionic strength and contain the same salts as the samples. 

Materials Required (i) Lead Nitrate Stock Solution Dissolve 0.1598 g of lead nitrate in 100 ml DW to which has been added 1 ml nitric acid, then dilute with water to 1 Litre. 

A 100 pg/L Ge stock solution was prepared In deionized water. A 1000 pg/L As stock solution was prepared In dilute nitric acid (5%). 

Stock solutions of Ge (100 pg/L) and As (1000 pg/L) were prepared in deionized water and dilute nitric acid (5%), respectively. 

A stock solution of 3.0% potassium permanganate in 10% nitric acid (prepared fresh daily) was used to stabilize the mercury collected in the rinses from the sampling train. The stabilized solutions were then returned to TraDets Columbus, Ohio laboratory for analysis. 

The above statement concerning the effectiveness of the nitronium ion over a wide range of conditions has not always been accepted and, until recently, some workers held that the nitronium ion was not the effective electrophile in solutions of nitric acid in aqueous acids and organic solvents. It is unnecessary now to go into these arguments since the subject has been covered in a number of recent reviews (Ridd, 1971a Hoggett et al., 1971 Stock, 1976), and the... 

As the result of oxalate ion complexing of Al3+, precipitation of Am-Cm-A1(N03)3 solutions was not straightforward. Using Dy as a stand-in for Am-Cm, simulated solutions were prepared where the ratio of A1(N03>3 to Dy (1 03)3, KF, NaN03, and Hg(1 03)2 was held constant as would result in actual process solutions. However, the total ratio of these species to free nitric acid was varied in the stock solutions. Precipitation conditions were simulated by additions of either a half-equal or an equal volume of either an 0.9M or a saturated ( 2M) potassium oxalate... 

Cadmium Calibration Standards Tare three clean, dry 4-oz polyethylene bottles (or equivalent). Add approximately 50 g of High-Purity Water to each. Slowly add 28 1 g of concentrated nitric acid, mix thoroughly, slowly add 12 1 g of concentrated hydrochloric acid, and mix thoroughly again. Using a precision micropipet, add 10, 50, and 500 pL, respectively, of Cadmium Stock Solution to one of each of the bottles. Dilute each solution to 100.0 0.1 g with High-Purity Water, and mix thoroughly to obtain calibration standards with 0.1, 0.5, and 5.0 mg/kg, respectively. 

Lead Nitrate Stock Solution Dissolve 159.8 mg of ACS reagent-grade Lead Nitrate [Pb(N03)i] in 100 mL of water containing 1 mL of nitric acid, dilute to 1000.0 mL with water, and mix. Each milliliter of this solution contains 100 xg of lead (Pb) ion. Prepare and store this solution in glass containers that are free from lead salts. 

Standard Lead Solution Prepare all lead solutions in 0.1% nitric acid. Use a single-element 1000 p,g/mL lead stock solution to prepare (weekly) an intermediate stock solution (1 p,g/ mL). Prepare (daily) a Standard Lead Solution (10 ng/mL) by diluting the intermediate stock solution 1 100 with 0.1 A nitric acid. 

Modifier Working Solution Weigh an amount of palladium nitrate equivalent to 1 g of palladium, and dilute to 100 mL with 15% nitric acid to make a stock solution. Just before use, prepare a Modifier Working Solution by diluting the stock solution 1 10 with water. 

Chromium Stock Solution Transfer 192.3 mg of chromium trioxide, accurately weighed, into a 1000-mL volumetric flask, dissolve in 100 mL of water and 10 mL of nitric acid, dilute to volume with water, and mix. This solution contains 0.1 mg of chromium per milliliter. Transfer 100.0 mL of the solution into a 1000-mL volumetric flask, dilute to volume with water, and mix. This solution contains 10 (ig of chromium per milliliter. 

Standard Preparation and Blank Preparation Transfer 5.0 mL of Lead Nitrate Stock Solution into a 100-mL volumetric flask, dilute to volume with water, and mix. Transfer 2.0 mL of the resulting solution into a 50-mL beaker. Add 8 mL of hydrochloric acid and 2 mL of nitric acid to this beaker, and to a separate 50-mL beaker (blank). Place a ribbed watch glass over each beaker, and evaporate to dryness on a steam bath. Add 10 mL of 9 N hydrochloric acid to each beaker, and transfer the resulting solutions, with the aid of about 10 mL of water, to separate 50-mL volumetric flasks. Add 20... 

Calibration Standards A suitable stock standard [accuracy certified against National Institute of Standards and Technology (NIST) spectrometric standard solutions] may be purchased and used to prepare a Working Standard with a concentration of 100 xg/L. Prepare five calibration standards of 2.0, 5.0, 10.0, 25.0, and 50.0 xg/Lby quantitative dilution of the Working Standard with 2% nitric acid. 

Palladium Stock Solution Transfer 1 g of ultrapure palladium metal, accurately weighed, into a Teflon beaker. Add 20 mL of water and 10 mL of nitric acid, and warm the solution on a hot plate to dissolve the palladium. Allow the solution to cool to room temperature, transfer it into a 100-mL volumetric flask, and dilute to volume with deionized water. 

Modifier Working Solution Transfer 3 mL of 1% Palladium Stock Solution and 2 mL of 7% Magnesium Nitrate Stock Solution into a 10-mL volumetric flask, and dilute to volume with 2% nitric acid. A volume of 5 piL provides 0.015 mg of palladium and 0.01 mg of magnesium nitrate. 

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