38results about How to "Low blank value" patented technology

The subject of the present invention is to provide a method for producing a silica gel supporting a derivatizing agent for a carbonyl compound that hardly collects carbonyl compounds during production thereof, and a silica gel supporting a derivatizing agent for a carbonyl compound produced by said production method, in order to lower a blank value in measurement of carbonyl compounds. The present invention also relates to a method for producing a silica gel supporting a derivatizing agent for a carbonyl compound characterized by bringing an acid-supported silica gel into contact with an organic solvent containing the derivatizing agent for a carbonyl compound, a silica gel filler supporting a derivatizing agent for a carbonyl compound comprising the silica gel supporting the derivatizing agent for a carbonyl compound produced by the above production method, a method for producing a silica gel supporting a derivatizing agent for a carbonyl compound characterized by treating in advance a silica gel having a cation-exchange group with the derivatizing agent for a carbonyl compound and then bringing it into contact with an organic solvent containing the derivatizing agent for a carbonyl compound, and the like.

The invention relates to immunological assay reagents and assay method. Immunological assay reagents comprise a composition containing a conjugate composed of an antigen or an antibody against the subject to be assayed and biotin bonded thereto and another composition containing avidin-binding particles, wherein biotin is bonded to the antigen or antibody in the above-described conjugate in such an amount that it would not undergo agglutination together with the above-described avidin-binding particles in the absence of the subject to be assayed; and an immunological assay method which comprises bringing a sample to be assayed into contact with a conjugate composed of an antigen or an antibody against the subject to be assayed and biotin bonded thereto (provided that biotin is bonded to the antigen or antibody in such an amount that it would not undergo agglutination together with the above-described avidin-binding particles in the absence of the subject to be assayed) and avidin-binding particles, and then evaluating the extent of the agglutination caused by the immune complex formed by the subject to be assayed and the conjugate and the avidin-binding particles. By using the above immunological assay reagent and the immunological assay method, a subject to be assayed can be accurately assayed without resort to a procedure of carrying an antibody or an antigen on latex particles (i.e., being free from the autoagglutination of latex particles), thereby achieving a reactivity comparable or even superior to those obtained by the conventional sensitized latex method.

An immunological analyzing reagent comprising a composition containing a biotin-conjugated antigen or antibody against a substance to be analyzed, and a composition containing an avidin-conjugated microparticle, wherein the biotin-conjugated antigen or antibody contains an amount of biotin which does not substantially agglutinate with the avidin-conjugated microparticle in the absence of the substance to be analyzed, is disclosed. Further, an immunological analyzing method comprising the steps of: bringing into contact a sample, a biotin-conjugated antigen or antibody against a substance to be analyzed, and an avidin-conjugated microparticle, the biotin-conjugated antigen or antibody containing an amount of biotin which does not agglutinate with the avidin-conjugated microparticle in the absence of the substance to be analyzed; and detecting the degree of aggregation between the avidin-conjugated microparticle, and an immunocomplex formed from the substance to be analyzed and the biotin-conjugated antigen or antibody, is disclosed. According to the immunological analyzing reagent and analyzing method, a procedure in which an antibody or antigen is carried on a latex particle is not necessary; self-aggregation of latex particles does not occur; a precise measurement of the substance to be analyzed may be carried out; and an excellent reactivity the same as or superior to that obtained by the conventional sensitized latex method may be obtained.

The implementation mode in the invention provides a purity detecting method and a device for polysilicon, which belongs to the fields of chemical industry and solar energy. The method comprises the following steps: after evenly mixing silicon powder, washing with secondary deionized water, and drying to constant weight; putting the dried silicon powder on a Teflon tray, adding water to moisturizethe sample, and adding a polyol solution; putting the Teflon tray on a Teflon container, putting the Teflon container in a seal body, adding HF and HNO3 into the lower part of the seal body, sealing the seal body, and heating to 110-120 DEG C; and after the silicon powder is completely dissolved and volatilized to the dry state, adding HNO3 to dissolve residues, transferring to a plastic volumetric flask, and measuring the content of impurity elements after the volume becomes constant. The specific implementation mode in the invention also provides a special device for realizing the purity detecting method for polysilicon. The method and the device have the advantage of high detection accuracy.

The invention discloses a sampling membrane and a sampler capable of enriching heavy metals in ambient air and an application method of the sampler. The sampling membrane comprises a nanometer fiber membrane and an air-permeable supporting padding arranged below the nanometer fiber membrane. The sampler comprises the sampling membrane and a sampling clamp; the sampling clamp is composed of an upper cone and a lower cylinder, wherein the upper surface of the cone is horizontal, the cylinder is composed of an upper cylinder and a rotary lower cylinder, the side surfaces of the upper cylinder and the lower cylinder are provided with uniformly distributed vertical ridges, the vertical ridges on the upper cylinder and the lower cylinder are aligned by rotating the lower cylinder, so fixation of the sampling membrane on the horizontal surface of the sampling clamp is realized. After heavy metals in air are acquired by using the sampler, a filter membrane is taken out and put into a centrifuge tube filled with a buffer solution, a solution is used for desorption of the heavy metals on the filter membrane, and after desorption, the solution is determined. According to the invention, detection sensitivity can be substantially improved, pre-treatment of a sample is easy and feasible, and nanometer fiber filter membranes with different functions are used for different detection objects, thereby improving absorption and acquisition efficiency.

The invention discloses a method for detecting six phthalates in drinking water through liquid chromatography-mass spectrometry, and belongs to the technical field of drinking water detection. The method comprises the following steps: (1) additionally arranging a protection column; (2) measuring conditions and a mode; (3) establishing a standard working curve; (4) detecting to-be-detected drinking water. According to the detection method, a sample is not required to be pretreated and can be directly fed, so that the six phthalates (DMP (Dimethyl Phthalate), DEP (Diethyl Phthalate), DBP (Dibutyl Phthalate), BBP (Benzyl Butyl Phthalate), DEHP (Di 2-Ethyl Hexyl Phthalate) and DNOP (Di N Octyl Phthalate)) in the drinking water are qualitatively and quantitatively analyzed at high speed; the method has the advantages of easiness and convenience in operation, less sampling quantity, low cost, good reproducibility, high stability and the like, is not only suitable for daily environment monitoring and is also suitable for quick screening of pollutants in emergency accidents.

The invention discloses a sample processing method for detecting boron in industrial silicon with graphite furnace atomic absorption spectrometry. The method comprises the following steps: weighing proper sample silicon powder; selecting proper acid to digest and dissolve the sample; heating to volatilize the silicon, and separating the residue; and filtering to obtain a clear solution and adding Zr-Ba serving as a proper matrix modifier to suppress the interference of a matrix. The method disclosed by the invention can be used for increasing the measurement sensitivity of the graphite furnace atomic absorption spectrometry and improving precision, is high in measurement speed, small in interference, high in accuracy and low in measurement cost, and is especially suitable for the quality detection in an industrial silicon production enterprise.

A method for detecting cadmium content in cigarette used tipping paper is characterized in that the method can quickly and accurately detect the cadmium content in the cigarette used tipping paper by the following steps: adopting mixed acid to carry out microwave digestion for a sample, removing the acid and fixing volume, conducting detection with a graphite furnace atomic absorption spectrophotometer, etc. The method overcomes the shortcoming of the prior art in processing the sample. Compared with the traditional electric heating plate digestion manner, the microwave digestion manner can reduce the usage of samples and strong acid, improve digestion ability, cause less loss to elements to be detected in the sample and less damage to an operator, and facilitate operation. The digestion system of compound acid is completely applicable to the special material of the cigarette used tipping paper. The acid removing process is quick and easy, and a matrix modifier is adopted to eliminateinterference. After being detected by optimal heating programs, ashing temperature and atomization temperature related to atomic absorption spectrometry, the special material of the cigarette used tipping paper is recovered with high rate, and detected with accurate result. The working efficiency and the economic benefits are significantly improved.