Dmg For Finding Nickel Concentration

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Dmg For Finding Nickel Concentration 7,1/10 6323 votes

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Solid chelating compounds such as dimethylglyoxime (DMG), acenaphthenequinone dioxime (ANDO) and their mixed ligands (DMG-ANDO) supported on naphthalene were found to provide a rapid and economical route to the pre-concentration of nickel in alloys and biological and natural water samples.

Dmg for finding nickel concentration freeWhat I need to figure out:
Dmg For Finding Nickel ConcentrationWe did a gravimetric analysis lab and I have masses for the DMG-Ni complexes that we recovered but I need to find the percent nickel in each sample.
  • Apr 15, 2004  A 1.0 ml sample should release enough reagent to complex 7.4 μg of nickel(II), or a 1.0 ml sample with a nickel(II) concentration of 7.4 ppm. This claim is supported by Fig. 5, which shows the response for the precipitate at 540 nm as solution concentration is increased.
  • Jul 10, 2010  0.0532 g Ni(DMG)2 / 290.95 (g/mol Ni(DMG)2) = 1.83 moles Ni(DMG)2 Which translates to 1.83 moles Ni in the original sample. Now we convert back to grams of nickel.
  • If you're starting from an alloy or metallic nickel, this would be a necessary first step. Heating would just be done to speed up the reaction and/or to make sure all of the nickel atoms were oxidized. Nickel doesn't dissolve in HCl by itself very readily, so I imagine high concentration.

Dmg For Finding Nickel Concentration Formula


Relevant Equations: I believe you take the mass of the DMG-Ni complex sample and multiply that by the mass ratio of Ni2+ over the FW of DMG. Then divide the result by the mass of the sample and multiply by 100%.

The Attempt at a Solution


I did what I layed out above but I get the same percentage Ni2+ for each sample which doesn't make sense so I must have gone wrong. Any help would be great![/B]

Use of dimethylglyoxime, acenaphthenequinone dioxime and mixed ligands of dimethylglyoxime and acenaphthenequinone dioxime supported on naphthalene for the pre-concentration and determination of nickel in alloys, tea and water samples using atomic absorption spectrometry

Abstract

Solid chelating compounds such as dimethylglyoxime (DMG), acenaphthenequinone dioxime (ANDO) and their mixed ligands (DMG-ANDO) supported on naphthalene were found to provide a rapid and economical route to the pre-concentration of nickel in alloys and biological and natural water samples. Nickel formed chelates with DMG, ANDO and DMG-ANDO supported on microcrystalline naphthalene in a column at pH in the ranges 5.0–9.4, 6.1–11.0 and 7.1–11.0, respectively. The metal complex and naphthalene were dissolved out from the column using 3 ml of dimethylformamide-nitric acid and the absorbance was measured by an atomic absorption spectrometer at 232 nm. The calibration graphs obtained were linear over the concentration range 5–40 µg (for DMG) and 2–30 µg (for ANDO and DMG-ANDO) of nickel in 3 ml of the final solution. The precision and detection limits of the method were studied for DMG, ANDO and DMG-ANDO. The sensitivities for 1% absorption were 0.132, 0.104 and 0.100 µg ml–1 for DMG, ANDO and DMG-ANDO, respectively (0.153 µg ml–1 for the direct determination from the aqueous medium by atomic absorption spectrometry). The method was used for the determination of nickel in various standard reference materials and water samples from different natural sources.

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