7 results about "Coulometry" patented technology

The invention relates to the technical field of heavy oil detection, in particular to a method for detecting the content of organic chlorine in heavy oil, which comprises the following steps: removing free water from to-be-detected heavy oil containing free water to obtain a heavy oil sample containing emulsified water, taking out the heavy oil sample containing emulsified water, adding a solvent which has a boiling point higher than 204 DEG C and is insoluble in water to obtain a diluted crude oil sample, and measuring the content of organic chlorine in heavy oil. The method comprises the following steps: centrifuging and dehydrating a thin oil sample to obtain a dehydrated crude oil sample, distilling the dehydrated crude oil sample to obtain fractions at the temperature of 204 DEG C or below, and detecting by using a micro-coulomb method to obtain the content of organic chlorine in the thickened oil. According to the method, the water-insoluble solvent with the boiling point higher than 204 DEG C is used for diluting the thickened oil, then the distillate oil with the boiling point higher than 204 DEG C is distilled out, and then the content of the organic chlorine in the distillate oil with the boiling point higher than 204 DEG C in the crude oil is determined by the microcoulometric method, so that the method has the advantages of high efficiency, simplicity and accurate measurement result, meets the GB / T 18612 requirement, and can realize rapid and accurate detection of the content of the organic chlorine in the water-containing thickened oil.

Various embodiments of the teachings herein include a method for ascertaining at least one average capacity loss of a battery storage device. The method may include: measuring at least two load cycles of the battery storage device using a high precision coulometry apparatus; determining a first charge displacement and a second charge displacement; determining a capacity loss equal to the difference between the first charge displacement and the second charge displacement; repeatedly measuring load cycles until the capacity loss is almost constant in at least two consecutive load cycles; and ascertaining an average capacity loss based on at least two capacity losses.

Systems and method for use in measuring lead levels in biological samples is provided. Using square wave coulometry and colloidal metallic particles impregnated on printed carbon electrodes on a sensor, the system provides a rapid, reliable, portable and inexpensive means of detecting low lead levels.

The utility model relates to the technical field of coulometry trace moisture meter electrolytic tanks, and discloses a coulometry trace moisture meter electrolytic tank with a light shield device, which comprises a light shield body, an observation component is arranged at the top of the light shield body, a sample injection component is arranged on one side of the light shield body, and a sample discharge component is arranged on the other side of the light shield body. And an electrolytic tank assembly is arranged in the light shield body. The coulometry trace moisture meter electrolytic tank with the light shield device and the coulometry trace moisture meter are simple in structure and convenient to disassemble, have the functions of shielding light, dehumidifying, preserving heat and preventing corrosive gas from corroding the electrodes, and compared with a traditional trace moisture meter, the coulometry trace moisture meter electrolytic tank and the coulometry trace moisture meter have the advantages that the requirement for the instrument installation environment can be lowered, and the cost is lowered. According to the coulometry trace moisture meter electrolytic tank, the electrolyte state can be kept in a balanced state, the purpose of rapidly measuring a sample is achieved, the coulometry trace moisture meter electrolytic tank can ensure that the meter can prolong the service time of electrolysis, and the pollution of a Karl Fischer reagent to the environment is reduced.

The lithium-ion single cells after formation are measured using high precision coulometry in order to relatively quickly group the lithium-ion single cells into a grade according to their expected aging, wherein one or more criteria including coulombic efficiency, energy efficiency, average capacity loss, and effective single cell internal resistance are used for the grouping.

The present application provides a method for measuring trace water in cumene hydroperoxide solution. First, the concentration of the cumene hydroperoxide solution is measured by indirect iodine titration, then the cumene hydroperoxide solution is reduced by adding excess triphenylphosphine to eliminate the oxidizing property of the cumene hydroperoxide, and the reduced solution is obtained, then the water content of the reduced solution is measured by Karl Fischer coulometry, and finally the water content of the original cumene hydroperoxide solution is converted. According to the method described in the present application, the trace water content in the cumene hydroperoxide solution can be measured, the quality index of the cumene hydroperoxide is controlled, the influence of the water in the cumene hydroperoxide solution on the performance of the epoxidation catalyst in the subsequent section is avoided, and the service life of the catalyst is prolonged.