Method for detecting cadmium chloride and cadmium sulfide in pigment simultaneously
A technology of cadmium chloride and cadmium sulfide, which is applied in the field of analysis and detection, can solve the problems of inability to separate and measure a single cadmium compound, and achieves the effect of simple method and low interference.
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Embodiment 1
[0033] After the pigment sample is dried, it is ground and passed through a 100-mesh sieve to obtain a powder sample, which is mixed evenly. Take 0.1010g of sample powder, add 30.0mL of concentrated nitric acid, digest on an electric heating plate at 300°C, and digest until nearly dry, add 3mL of concentrated nitric acid, continue heating to remove the acid until nearly dry, after cooling, double-distilled water to 25mL, graphite furnace atomic absorption The spectrometer was used to determine the total cadmium content (C 1 ) is 1.89×10 -3 μg / mL; take another 0.1078g sample powder and add 20mL ethanol, shake and extract for 20min, filter paper, discard the filtrate, wave the remaining powder on the filter paper to remove ethanol at room temperature, transfer all of it to a beaker with 10mL concentrated nitric acid, add 20mL concentrated nitric acid, Digest on an electric heating plate until it is almost dry, add 3mL of concentrated nitric acid, continue to heat the acid until...
Embodiment 2
[0035] After the pigment sample is dried, it is ground and passed through a 100-mesh sieve to obtain a powder sample. Take 100.0g of sample powder, add 14.5337mg of cadmium chloride and 9.0854mg of cadmium sulfide, and mix well to obtain a spiked sample. Take 0.10749g of sample powder in the spiked sample, add 30mL of concentrated nitric acid, digest on an electric heating plate at 300°C, and digest until nearly dry, add 3mL of concentrated nitric acid, continue to heat the acid until it is nearly dry, and distill the water to 25mL after cooling. Get 0.5mL and dilute to 10mL, graphite furnace atomic absorption spectrometer measures total cadmium content (C 1 ) was 0.0344μg / mL; take another 0.1022g sample powder and add 20mL ethanol, shake and extract for 20min, filter paper, discard the filtrate, wave the ethanol off the residual powder on the filter paper at room temperature, transfer all of it to a beaker with 10mL concentrated nitric acid, add 20mL Concentrated nitric acid...
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