Nickel Standard Solution

Standard Preparations Prepare three Standard Preparations in the same manner as in the Test Preparation, but add 0.5 mL, 1.0 mL, and 1.5 mL, respectively, of 10 mg/kg nickel standard solution TS in addition to 20.0 g of sample. 

Nickel Standard Solution TS (10 mg/kg) Prepare a 0.40% (w/v) solution of analytical reagent-grade nickel chloride (NiCl2-6H20) with water. Pipet 1.0 mL of the solution into a 100-mL volumetric flask, and dilute to volume with water. 

Solutions and Indicators, 110 Acetic Acid TS, Strong, 110 Nickel Standard Solution, 110 Quimociac TS, 110 Sodium Hydroxide, 1 TV, 110 Sorbic Acid, 59 Soy Protein Concentrate, 59 Sucrose Acetate Isobutyrate, 60, 101 Sulfurol, 84 Sunset Yellow FCF, 29... 

Nickel cyclohexanebutyrate NBS No. 1065b, 13.89% Ni, for preparation of organo-nickel standard solution. 

Figure 8.44 Pyrolysis curves for a 2.6 ng nickel standard solution (Ni salt of 2-ethylhexanoic acid) in base mineral oil, and a crude oil sample, diluted with IBMK and as oil-in-water emulsions, respectively, using LS GF AAS...

HR-ICP-MS EEEMENT-2 (Pinnigan MAT, Germany) equipped with a standard introduction system (quartz water-cooled spray chamber, concentric nebulizer, torch with 1.5 mm i.d. injector and nickel cones) was used for measurements. The following operating conditions were used RP power 1150 W, coolant gas flow rate 16 1 min k auxiliary gas flow rate 0.85 1 min nebulizer gas flow rate 1.2 1 min k Sample uptake rate was 0.8-1 ml min k Measurements were performed with low and middle resolutions. Rh was used as an internal standard. Por calibration working standard solutions were prepared by diluting the multielemental stock solutions CPMS (SPEX, USA) with water to concentration range from 5 ng to 5 p.g I k... 

Prepare the standard nickel solution by dissolving 0.673 g pure ammonium nickel sulphate in water and diluting to 1 L 1 mL contains 0.1 mg of Ni. The solution may be further diluted to a basis of 0.01 mg of Ni per mL, if necessary. Pure nickel may also be employed for the preparation of the standard solution. 

Aqueous standard solutions are a source of certain difficulties In electrothermal atomic absorption spectrometry of trace metals In biological fluids The viscosities and surface tensions of aqueous standard solutions are substantially less than the viscosities and surface tensions of serum, blood and other proteln-contalnlng fluids These factors Introduce volumetric disparities In pipetting of standard solutions and body fluids, and also cause differences In penetration of these liquids Into porous graphite tubes or rods Preliminary treatment of porous graphite with xylene may help to minimize the differences of liquid penetration (53,67) A more satisfactory solution of this problem Is preparation of standards In aqueous solutions of metal-free dextran (50-60 g/llter), as first proposed by Pekarek et al ( ) for the standardization of serum chromium analyses This practice has been used successfully by the present author for standardization of analyses of serum nickel The standard solutions which are prepared In aqueous dextran resemble serum In regard to viscosity and surface tension Introduction of dextran-contalnlng standard solutions Is an Important contribution to electrothermal atomic absorption analysis of trace metals In body fluids. 

Standard solutions, a solution of nickel in acid with a quoted mass/volume concentration, a solution of sodium hydroxide with a quoted concentration as a molarity and a solution of pesticides with quoted mass/volume concentrations. Matrix RMs - natural materials, river sediment with quoted concentrations of metals, milk powder with a quoted fat content and crab paste with quoted concentrations of trace elements. 

To prevent systematic mistakes in the dilution series of the ligand standard solutions, leading to relative shifts in the [L]-control maps, we carried out independent control catalyses on the 250-ml scale. For the ([L]o/[Ni]o) ratio we selected inflection points in the varying product distribution of the [L]-control maps. In Fig. 3.2-2 is exemplified the [L]-control map of the catalytic system nickel/phenyl-diphenoxi-phos-phine/butadiene. ... 

The following blank-corrected readings were obtained for the determination of nickel in steel, using nickel standards dissolved in iron solution (10 g k ). The determination was performed by atomic absorption spectrometry using an air-acetylene flame and the 232 nm nickel line. 

Another chemical interference encountered in AAS is that with chromium determinations where the chromium absorption in an air—acetylene flame is suppressed by iron, cobalt and nickel. In this instance, the iron interference can be minimised by the addition of 2% (m/v) ammonium chloride solution to the sample and standard solutions. This compound helps volatilise the chromium as chromyl chloride (Cr02Cl). 

Aspirate solutions into a fuel-lean air—acetylene flame and measure nickel absorbance at 232.00nm. Aspirate organic solvent solutions into the same flame previously optimized on nickel standards in an identical matrix. Flush the burner with 3-heptanone after aspiration of each standard and sample solution. For vegetable oils in MIBK, follow the tentative AOCS procedure [23d] as described in Section IV.B.6(iii). Prepare organo-nickel stock solution from 0.0360 g of Ni cyclohexane butyrate (NBS No. 1065b, 13.89% Ni, desiccated for 48 h over P205) according to the procedure in the same section. Aspirate sample and standard solutions into an optimized aii -acetylene flame. 

Price [67] has reviewed the application of atomic absorption to a variety of plating solutions. Iron, lead and zinc are reported as the main impurities in cyanide copper-plating baths which may contain up to 200gl 1 of copper sulphate a twenty-fold dilution of the sample for trace determination is recommended. Nickel baths may contain 60 gl 1 of nickel and it may be necessary to monitor copper, zinc, iron, lead, chromium, calcium and magnesium at the ppm level. The standard addition method is probably best for such an application. Zinc has been extracted with trioctylamine-hydrochloride when present in the range 0.03—10pgml-1 in a nickel plating solution [68]. The zinc was re-extracted back into 1M nitric acid for... 

Transfer 10 )li1 of the blood sample to a 10x5 mm nickel crucible (Delves cup), add 10 jiil of water, and heat at 150° for 1 minute or until sputtering occurs. Add 20 li1 of strong hydrogen peroxide solution, and evaporate to dryness at 150°. Place the cup in the air-acetylene flame and imder the nickel absorption tube, and record the absorbance at 217 nm. The correct positioning of the cup is crucial. Repeat the procedure using a series of nickel crucibles containing, individually, 10 ll1 of the pooled normal blood and 10 p, of each diluted standard solution. 

Metal-support interaction was observed in two nickel-silica catalysts, but they were prepared either by precipitating a complex carbonate from nickel nitrate solution containing Si02 as a slurry or co-precipitating the carbonate from a solution of nickel nitrate and sodium silicate. The similar spectra from the unreduced catalysts resembled in shape and binding energy a NiSi03 standard and were quite distinct from NiO. The interaction was... 

Table 1 Absorbance data measured from standard solutions of chromium and nickel by AAS (a). Calculation of the best-fit, least-squares line for the nickel data, (b)...

Figure 1 Calibration plots of chromium (a) and nickel (b) standard solutions, from data in Table 1. For chromium, a good jit can be dravm by eye. For nickel, however, a regression model should be derived. Table 1(b)...

Christov calculated the parameters in the Pitzer ion interaction model from isopiestie measurements at 298.15 K by Ojkova and Staneva [890JK/STA]. This reference contains (interpolated) osmotic coefficients of zinc, magnesium, cobalt, and nickel selenate solutions from 0.1 mol-kg to saturated solution. Sodium chloride standards were used and the agreement between duplicate determinations was 0.2% or better. 

The flow system is designed to permit successive injections of the sample, each one accompanied by the injection of a different standard solution. Merging of the established zones permits the efficient implementation of the standard addition method involving a fixed sample dilution. The approach was initially exploited in the routine analysis of copper/ nickel alloys by ICP-OES [22], the spectral interferences being minimised by applying the generalised standard addition method [23]. This innovation however required the preparation of a large set of standard solutions. 

Spectrophotometric determination of the extractable content of chromium, lead, nickel and zinc in sewage sludges. A similar strategy to the above-mentioned [355] was used but different standard solution streams were involved. Matrix effects were successfully overcome [356],... 

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