This colourless solid is the dioxime derivative of the diketone butane-2,3-dione (also known as diacetyl). DmgH 2 is used in the analysis of palladium or nickel.
Dmg Reaction With Nickel Free Radical InitiatorThe morphology of the Ni(II)-DMG IIP and non-imprinted polymer were. The reaction proceeds via a free radical initiator in an appropriate solvent.A highly selective procedure is proposed for the determination of ultra-trace level concentrations of nickel in saline aqueous matrices exploiting a micro-sequential injection Lab-On-Valve (muSI-LOV) sample pretreatment protocol comprising bead injection separation/pre-concentration and detection by electrothermal atomic absorption spectrometry (ETAAS). Based on the dimethylglyoxime (DMG) reaction used for nickel analysis, the sample, as contained in a pH 9.0 buffer, is, after on-line merging with the chelating reagent, transported to a reaction coil attached to one of the external ports of the LOV to assure sufficient reaction time for the formation of Ni(DMG)(2) chelate. The non-ionic coordination compound is then collected in a renewable micro-column packed with a reversed-phase copolymeric sorbent containing a balanced ratio of hydrophilic and lipophilic monomers.Of the 63 initially DMG-test patch test reactions in the majority of nickel allergic negative or doubtful components, 28 were retested, patients when used for patch testing but corrosion excluding those with a negative XRF-result and and DMG testing showed nickel release below 0.5 the lowest nickel compound Ni(DMG)2 and published the first paper. Under the optimized conditions and for a sample volume of 1.8 mL, a retention efficiency of 70 % and an enrichment factor of 25 were obtained. The proposed methodology showed a high tolerance to the commonly encountered alkaline earth matrix elements in environmental waters, that is, calcium and magnesium, and was successfully applied for the determination of nickel in an NIST standard reference material (NIST 1640-Trace elements in natural water), household tap water of high hardness and local seawater. Satisfying recoveries were achieved for all spiked environmental water samples with maximum deviations of 6 %.To evaluate the sensitivity and specificity of the DMG test. Because assessments according to EN 1811 are expensive to perform, time consuming, and may destruct the test item, it should be of great value to know the accuracy of the DMG screening test. The EN 1811, a European standard reference method developed by the European Committee for Standardization (CEN), is fine-tuned to estimate nickel release around the limit value of the EU Nickel Directive from products intended to come into direct and prolonged skin contact. The EN 1811, a European standard reference method developed by the European Committee for Standardization (CEN), is fine-tuned to estimate nickel release around.Sensitivity and specificity of the nickel spot ( dimethylglyoxime) test.Thyssen, Jacob P Skare, Lizbet Lundgren, Lennart Menné, Torkil Johansen, Jeanne D Maibach, Howard I Lidén, CarolaThe accuracy of the dimethylglyoxime ( DMG) nickel spot test has been questioned because of false negative and positive test reactions. Since Tschugaeffs time the nickel, palladium.Sensitivity and specificity of the nickel spot ( dimethylglyoxime) testThyssen, Jacob P Skare, Lizbet Lundgren, LennartThe accuracy of the dimethylglyoxime ( DMG) nickel spot test has been questioned because of false negative and positive test reactions.Past exposure studies may have underestimated nickel release from consumer items.The accuracy of the dimethylglyoxime ( DMG) nickel spot test has been questioned because of false negative and positive test reactions. It may serve well for screening purposes. The DMG test has a high specificity but a modest sensitivity. The sensitivity of the DMG test was 59.3% and the specificity was 97.5% based on DMG-test results and nickel release concentrations determined by the EN 1811 reference method. The dimethylglyoxime ( DMG) test might be used to establish skin exposure to nickel. Visualization techniques may be powerful in showing exposures. Because assessments according to EN 1811 are expensive to perform, time consuming, and may destruct the test item, it should be of great value to know the accuracy of the DMG screening test.Nickel deposited on the skin-visualization by DMG test.Julander, Anneli Skare, Lizbet Vahter, Marie Lidén, CarolaNickel is the most common cause of contact allergy and an important risk factor for hand eczema. The limit value of the EU Nickel Directive from products intended to come into direct and prolonged skin contact. Error sans simulator 2 playerThe lowest concentration giving rise to a colour change was set to 0.13 µg/cm(2) for DMG testing on skin. The DMG test on hands gave positive results in all subjects. The imprints were developed by the DMG test. Hand imprints were taken after manipulation of nickel-releasing tools (n = 1), and in workers performing their normal tasks (n = 7). The DMG test and acid wipe sampling for quantification were then performed. Nickel solutions at different concentrations were applied in duplicate on the hands in healthy subjects (n = 5). This aimed to improve the performance of this ion-imprinted polymer in trapping Ni(II) ions from soil and mine tailing samples .Effective removal of Ni(II) from aqueous solutions by modification of nano particles of clinoptilolite with dimethylglyoxime.Nezamzadeh-Ejhieh, Alireza Kabiri-Samani, MehdiIn this work an Iranian natural clinoptilolite tuff was pre-treated and changed to the micro (MCP) and nano (NCP) particles by mechanical method. A Ni(II)-dimethylglyoxime ion-imprinted polymer was optimised by the uniform design experimental method and used to adsorb Ni(II) ions from water, soil and mine tailing samples. © 2011 John Wiley & Sons A/S.Optimal synthesis of a Ni(II)-dimethylglyoxime ion-imprinted polymer. DMG test-developed hand imprints may, in the future, be used for semi-quantitative or quantitative exposure assessment. The DMG test may be used as a simple and powerful tool for visualization of nickel on skin. Langmuir and Freundlich isotherm models were adopted to describe the adsorption isotherms. The results of selectivity experiments showed that the modified zeolite has a good selectivity for nickel in the presence of different multivalent cations. The effects of analytical parameters such as pH, dose of DMG, concentration of nickel solution, contact time and selectivity were studied and the optimal operation parameters were found as follows: pHPZC: 7.6, CNi(II): 0.01 M, contact time: 360 min and DMG dosage: 5mM. It was found that NCP- DMG has higher capacity for removal of Ni(II). Removal of Ni(II) by modified and unmodified samples was investigated in batch procedure. The raw and modified samples were characterized by XRD, FT-IR, SEM, BET, TG-DTG and energy dispersive analysis X-ray spectroscopy (EDAX). Rpg maker mv sprite sheetCopyright © 2013 Elsevier B.V. The negative ΔS indicates that the adsorption of nickel cations from solution occurs with lower amount ion replacement, thus chemisorptions due to complex formation are dominant process in nickel removal. The negative ΔH and ΔG indicate an exothermic and spontaneously process. Comparison of two kinetic models indicates that the adsorption kinetic can be well described by the pseudo-second-order rate equation that indicates that the rate limiting step for the process involves chemical reaction. To identify nickel release and metal content in earrings purchased in China and Thailand. (author)Assessment of nickel release from earrings randomly purchased in China and Thailand using the dimethylglyoxime test.Hamann, Carsten R Hamann, Dathan J Hamann, Quinlan J Hamann, Curtis P Boonchai, Waranya Li, Lin-Feng Thyssen, Jacob PChina and Thailand produce large amounts of jewellery that are sold domestically and abroad. PAN- DMG material ( dimethylglyoxime in porous beads of polyacrylonitrile) was compared with Ni Resin and DMG-PAN material exhibited higher sorption capacity for nickel than Ni Resin. Quantitative separation from 100 mL of real concentrate on the column filled with 3 mL of PAN- DMG composite material was achieved. The proposed method was tested with two types of real radioactive waste (boric acid concentrate from nuclear power plant (NPP) evaporator and spent ion exchanger from NPP). Method for preparation of 59 Ni source for low energy photon spectrometry was developed using homogeneous precipitation of nickel with DMG. These initiatives may eventually result in decreased morbidity among the Chinese and Thai citizens, but can potentially benefit recipient countries of these important earring producing countries.Determination of 59 Ni in radioactive wasteComposite material PAN- DMG, containing chelating agent dimethylglyoxime ( DMG) immobilized in porous matrix of binding polymer polyacrylonitrile (PAN), was used for nickel separation and concentration. In China, enforcement of the 2002 Chinese National Standard GB 11887 may assist in reducing sensitization.
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