Gas chromatography detection method for trace N,N-dimethyl formamide in synthesized leather
A technology of dimethylformamide and gas chromatography is applied in the field of detection of trace N,N-dimethylformamide in wet-process synthetic leather products, which can solve the problems of complicated operation, long time consumption and the like, and achieves good separation effect, Simple operation and cost saving effect
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Embodiment 1
[0029] The specific operation steps of gas chromatographic detection of trace amounts of N,N-dimethylformamide in polyurethane synthetic leather are as follows:
[0030] (1) Preparation of N,N-dimethylformamide solution: add about 10mL of methanol in advance into a 25mL volumetric flask, then add 113.0mg of N,N-dimethylformamide, then add methanol to the scale line, and prepare a concentration of 4. 520mg / mL N,N-dimethylformamide solution;
[0031] (2) Prepare the internal standard solution: add about 10mL of methanol in advance into a 25mL volumetric flask, then add 1.000g of n-butanol, then add methanol to the mark, and prepare an internal standard solution of n-butanol with a concentration of 40mg / mL;
[0032] (3) Sample pretreatment: Weigh about 1g of the polyurethane synthetic leather to be tested (about 2mm×2mm) after being cut into pieces, add it to a 45mL screw cap sample bottle, and add 0.1mL of n-butanol internal standard solution with a concentration of 40mg / mL , a...
Embodiment 2
[0038] (1) Preparation of N,N-dimethylformamide solution: add about 10mL of methanol in advance into a 25mL volumetric flask, then add 362.0mg of N,N-dimethylformamide, then add methanol to the scale line, and prepare a concentration of 14.48mg / mL N,N-dimethylformamide solution;
[0039] (2) Prepare the internal standard solution: add about 10mL of methanol in advance into a 25mL volumetric flask, then add 1.000g of n-butanol, then add methanol to the mark, and prepare an internal standard solution of n-butanol with a concentration of 40mg / mL;
[0040] (3) Sample pretreatment: Weigh about 1g of the polyurethane synthetic leather to be tested (about 2mm×2mm) after being cut into pieces, add it to a 45mL screw cap sample bottle, and add 0.1mL of n-butanol internal standard solution with a concentration of 40mg / mL , accurately add 20mL of analytical pure methanol, and tighten the bottle cap to obtain the treatment A;
[0041] (4) Sample pretreatment for adding standard samples: ...
Embodiment 3
[0046] (1) Prepare N,N-dimethylformamide solution: add about 10mL of methanol in advance to a 25mL volumetric flask, then add 232.4mg of N,N-dimethylformamide, then add methanol to the scale line, and prepare a concentration of 9. 296mg / mL N,N-dimethylformamide solution;
[0047] (2) Prepare the internal standard solution: add about 10mL of methanol in advance into a 25mL volumetric flask, then add 1.000g of n-butanol, then add methanol to the mark, and prepare an internal standard solution of n-butanol with a concentration of 40mg / mL;
[0048] (3) Sample pretreatment: Weigh about 1g of the polyurethane synthetic leather to be tested (about 2mm×2mm) after being cut into pieces, add it to a 45mL screw cap sample bottle, and add 0.1mL of n-butanol internal standard solution with a concentration of 40mg / mL , accurately add 20mL of analytical pure methanol, and tighten the bottle cap to obtain the treatment A;
[0049] (4) Sample pretreatment for adding standard samples: Weigh ab...
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