57results about How to "Injection volume is small" patented technology

The invention discloses a system for synchronous on-line detection of adsorption spectrum and fluorescence spectrum. The system consists of a reciprocating plunger pump, a sample introduction device, an enrichment device, a detection cell, a light source, a spectrograph, an optical fiber, a computer and a data processing system, wherein the sample introduction device is provided with a six-way valve; a sample passes through the reciprocating plunger pump according to a predetermined time, enters an active carbon enrichment column through the six-way valve and is discharged after online enrichment; after finishing enrichment, the six-way valve is switched; an eluate enters the active carbon enrichment column through the six-way valve; an enrichment substance is washed and enters a flow cell and is discharged after spectrum detection is performed on the enrichment substance; the content of the sample is calculated based on the change of spectrum intensity; and the flow cell is integrally connected with five-way valve formed by a light source radiation optical fiber interface hole, an ultraviolet visible light optical fiber interface hole, a fluorescence spectrum optical fiber interface hole, a liquid inlet pipe hole and a liquid outlet pipe hole. The system realizes the on-line detection of the adsorption spectrum and the fluorescence spectrum; and an instrument has the characteristics of small volume, light weight, good reproducibility, convenient carrying, and fast sample treating speed, so the system has wide application fields.

The invention discloses a method for determining the content of polyethylene glycol in a macromonomer of a polycarboxylate water reducer. Adopt HPLC method to detect, adopt standard curve method or external standard method to quantify, wherein, chromatographic column is C18 post; Mobile phase is the mixed solution of acetonitrile and water, and its weight percent example is acetonitrile: water=30~60:70~40. The invention adopts the HPLC method, uses acetonitrile / water as the mobile phase, reduces the sample injection volume, eliminates the influence of the solvent peak on the detection of the polyethylene glycol content, and is targeted at the polycarboxylate superplasticizer macromonomer The polyethylene glycol content in the medium provides a detection method, which has important practical significance. The method is accurate, simple, and the inspection period is short, about half an hour, which can provide a reference for the quality control of the superplasticizer macromonomer.

The invention discloses a method for quantitative detection of chromium element valence and content in a chromium-containing substance. The method includes: adding a chromium-enriched yeast stem cell sample into an alkali digestive juice to conduct treatment, then performing centrifugation, adjusting the pH of conditioning fluid to obtain a to-be-detected solution; preparing a chromium standard solution, performing testing, and establishing a chromium stand solution standard curve; subjecting the to-be-detected solution to high performance liquid phase separation, using an inductively coupled plasma mass spectrometry to analyze the Cr(VI) content, conducting acid digestion, and directly using inductively coupled plasma mass spectrometry to analyze the total chromium content of the sample, calculating the Cr(III) content through the difference of the total chromium content and the Cr(VI) content of the sample. The method provided by the invention improves the accuracy of sample measurement, has the characteristics of small sample size and short detection time, saves the sample preparation amount and measurement time, can accurately and quantitatively measure chromium-enriched yeasts with different chromium enrichment amounts.