60results about How to "Fast pre-processing" patented technology

The invention relates to a method for detecting the content of soluble zinc salt in cosmetic, in particular to a method for detecting the content of soluble zinc salt in cosmetic by an ultrasound centrifugal-inductively coupled plasma atomic emission spectrometry detection technology, which comprises the following steps: extracting cosmetic samples through ultrasound centrifugal, introducing the sample solution into an inductively coupled plasma atomic emission spectrometer nebulizer to form aerosol, loading the aerosol into a high-temperature high-frequency plasma by argon, causing ionization, generating characteristic lines, detecting line intensity of zinc in the sample solution, wherein the intensity and content of zinc are directly proportional, correcting response value of zinc according to the specific value of an actual-measurement indium internal standard response value and a predicted indium internal standard response value, adopting a calibration curve method for quantitative detection, and calculating the content (calculating by zinc) of the soluble zinc salt in the cosmetic. The invention has the characteristics of strong specificity, high sensitivity and correct result.

The invention discloses a method for carrying out chromatographic test pretreatment on a lithium battery electrolyte. A sodium carbonate solution with the purity being 99.9% is prepared into a saturated sodium carbonate water solution; the saturated sodium carbonate water solution is taken and put in a centrifugal tube, and an electrolyte sample is added for vortex oscillation; an organic solvent is added, vortex oscillation continues, standing is carried out, and after the mixture is completely layered, supernatant liquid is taken out and put in a glass sample bottle; the operation is repeated two times; finally, the glass sample bottle is subjected to nitrogen blowing at low temperature, and after the organic solvent is removed, liquid in the glass sample bottle is 3 ml to 10 ml. After chromatographic test pretreatment is carried out on the lithium battery electrolyte, qualitative and quantitative errors caused by the low content of an additive are eliminated, the lithium salt removal effect is good, therefore, consumption of gas chromatograph chromatographic columns and liner tubes is reduced, and the testing cost is reduced.

The invention discloses a method for rapidly identifying illegally added poppy shells in herbal tea. The method comprises the following steps: (1) carrying out ultrasonic treatment on a liquid herbal tea sample to obtain a herbal tea sample, regulating the herbal tea sample to be slightly alkaline, adding an organic solvent and sodium chloride, carrying out vortex extraction, centrifuging, layering, adding an ammonium acetate solution into supernatant, and uniformly mixing, thereby obtaining to-be-tested liquid; or adding an organic solvent into a solid herbal tea sample, carrying out ultrasonic treatment, cooling an extracting solution to room temperature, making up to constant volume, adding an ammonium acetate solution into the extracting solution, and uniformly mixing, thereby obtaining to-be-tested liquid; and (2) filtering the to-be-tested liquid by virtue of an organic phase filter membrane, with an acetic acid-methanol solution and an ammonium acetate solution as a mobile phase, carrying out reversed phase chromatographic column separation, and detecting five main ingredients, namely morphine, codeine, thebaine, papaverine and narcotine, in the poppy shells on eluent by adopting an ultra-high performance liquid chromatography-tandom mass spectrometer. The method disclosed by the invention has the advantages that pretreatment is simple and rapid, qualitative and quantitative treatment is accurate, and the illegally added poppy shell ingredients in the herbal tea can be rapidly and reliably detected.

The invention provides a method for detecting the hydrolysate of residual antibiotic, and is characterized in that the method comprises the following steps that: a dairy product to be detected and a blank control non-antibiotic milk sample undergo sterilization and cooling, and then ferment is added into the mixture so as to measure the initial pH value of the fermentation broth of the mixture; then, the mixture undergoes heat preservation at a temperature of between 40 and 45 DEG C for 1 hour, and the pH value of the fermentation broth is measured so as to calculate the difference value between the variation in pH value before and after fermentation and the variation value of non-antibiotic milk contrast sample; when the difference value is more than or equal to 0.3, the sample is judged as a positive sample. The minimum concentration of enzymolysis product detected by the method is equal to 10ppb; therefore, the method can realize sensitive and accurate detection of antibiotic enzymolysis residue in dairy products.

The invention relates to a method for rapid analysis determination of acetaldehyde in an electronic cigarette liquid, wherein the method comprises the following steps: firstly, adding a dispersing agent in an electronic cigarette liquid sample; then adding a DNPH derivatization reagent and an acidic solution, carrying out a derivatization reaction, and then adding an alkaline reagent and an internal standard substance; and finally analyzing and determining the content of acetaldehyde in the electronic cigarette liquid by using LC-MS / MS. The method has the advantages of high sensitivity, strong interference resistance, good repeatability, and simple and fast pretreatment process, and is suitable for detection of a large number of electronic cigarette liquid samples.

The invention discloses a method for rapidly detecting the content of B vitamins in pig intestinal contents / excrement. The method comprises the following steps: weighing cecum contents / excrement of pigs as a sample, adding a methanol / acetonitrile / water solution, and performing homogeneous extraction to obtain a sample solution; and performing UPLC-MS / MS-MRM detection analysis on the sample solution to finally obtain the content of eight B vitamins in the sample, wherein the eight B vitamins are vitamin B1, vitamin B2, nicotinic acid, nicotinamide, pyridoxal, pyridoxine, vitamin B9 and vitaminB12. According to the method, an MRM technology is utilized, an ultra-high performance liquid chromatography system and a mass spectrometer are combined, and the content of a plurality of B vitamins in the samples such as the pig intestinal contents and the excrement can be rapidly detected based on targeted metabonomics of an MRM method.

The invention provides a analysis and detection method of gas free radical in the mainstream smoke of cigarette, characterized by: using MALDI-FT-ICR-MS to detect the gas radical in mainstream smoke of cigarettes, concrete steps include: 1) choosing radical trap agent; 2) trapping gas radical in the gas; 3) choosing radical character; 4) Pointing and entering MALDI-FT-ICR-MS analysis; 5) analysis of spectrum analytical data; 6) further checking out the cigarettes free radical and its adducts in mainstream smoke of cigarettes. Advantages ars: MALDI-MS FT-ICR-soft ionization technology, high-resolution and high sensitivity can provide accurate analysis of the molecular mass, elemental composition, molecular structure and experience of information, to distinguish between two compounds in the mixture of very molecular weight nearly, is qualitative specific, sensitive, rapid and convenient detection advantage, but also suitable for high-throughput experiments. It provides a very favorable analytical tool for radical research and development.

The invention discloses a method for rapidly analyzing the occurrence state of rare earth by using visible light-near infrared reflectance spectroscopy, which comprises the following steps: (1) drying a weathering crust sample, putting the weathering crust sample into a vessel, and flattening the surface; (2) carrying out reflection spectrum measurement on the sample in the vessel by using a visible light-near infrared reflection spectrometer, wherein the spectrum range is set to be 350-2500nm; measuring the powder sample for a plurality of times from different directions at an interval of 90 degrees, measuring the rock block sample for a plurality of times from different directions at an interval of 30 degrees, and recording original spectral data; and (3) processing the obtained original spectrum data, carrying out peak shape fitting on 800nm absorption band characteristics, obtaining the position and relative intensity information of an absorption band, and judging the occurrence state of the rare earth element. The method provided by the invention can meet the requirement of weathering crust ion adsorption type rare earth deposit prospecting exploration work on rapid sample analysis.

The invention relates to a method for detecting the content of boric acid and borate in cosmetics. A method for measuring boric acid and borate in cosmetics by microwave digestion -ICP-OES comprises the following steps of: performing microwave digestion on a cosmetic sample through nitric acid and hydrogen peroxide to decompose organic substances, guiding sample solution into an inductive coupling plasma atomic emission spectrometer atomizer to form aerosol, loading the aerosol into high-temperature high-frequency plasma by argon to generate ionization and generate a characteristic spectral line, and measuring the spectral line intensity of a boron element and an internal standard yttrium element in the sample solution, wherein the intensity of the boron element is in direct proportion tothe content of the boron element; and correcting a response value of the boron element according to the ratio of an actually measured yttrium internal standard response value to an expected internal standard response value, performing quantitative measurement by adopting a standard curve method, calculating the content of the boron element in the cosmetics, and obtaining the content of the boric acid and the borate through conversion coefficients. The method has the characteristics of strong specificity, high sensitivity and accurate result.

The invention discloses a method for simultaneously measuring chlorotoluene compounds in leather by gas chromatography-mass spectrography. The method comprises the following steps: preparing a sample to be measured; extracting the sample; preparing a standard working solution; detecting a sample solution to be measured. According to the method, ultrasonic extracting, gas chromatography and mass spectrography are combined, so that chlorotoluene organic pollutants in the leather can be measured simultaneously; the method has the advantages of accuracy, quickness and high sensitivity; reliable detection method support is provided for quick detection of the leather.