265 results about "Trace metal" patented technology

Described herein are precursors and methods for forming silicon-containing films. In one aspect, the precursor comprises a compound represented by one of following Formulae A through E below:

In one particular embodiment, the organoaminosilane precursors are effective for a low temperature (e.g., 350° C. or less), atomic layer deposition (ALD) or plasma enhanced atomic layer deposition (PEALD) of a silicon-containing film. In addition, described herein is a composition comprising an organoaminosilane described herein wherein the organoaminosilane is substantially free of at least one selected from the amines, halides (e.g., Cl, F, I, Br), higher molecular weight species, and trace metals.

Recombinant Factor VIII can be produced in relatively large quantities on a continuous basis from mammalian cells in the absence of any animal-derived proteins such as albumin by culturing the cells in a protein free medium supplemented with polyol copolymers, preferably in the presence of trace metals such as copper. In very preferred embodiments, the medium includes a polyglycol known as Pluronic F-68, copper sulfate, ferrous sulfate/EDTA complex, and salts of trace metals such as manganese, molybdenum, silicon, lithium and chromium. With an alternative medium which included trace copper ions alone (without polyol copolymers) we were also able to enhance the productivity of Factor VIII in recombinant cells such as BHK cells that are genetically engineered to express Factor VIII.

An ion source chamber for ion implantation system includes a housing that at least partially bounds an ionization region through which high energy electrons move from a cathode to ionize gas molecules injected into an interior of the housing; a liner section defining one or more interior walls of the housing interior, wherein each liner section includes a interiorly facing surface exposed to the ionization region during operation the ion implantation system; a cathode shield disposed about the cathode; a repeller spaced apart from the cathode; a plate including a source aperture for discharging ions from the ion source chamber; wherein at least one of the repeller, the liner section, the cathode shield; the plate, or an insert in the plate defining the source aperture comprise silicon carbide, wherein the silicon carbide is a non-stoichiometric sintered material having excess carbon.

An electrodialysis method and apparatus are provided for treating a sample including trace metals in a matrix. Advantageously, the present invention allows for highly accurate detection of trace contaminants in a solution sample, in particular trace metals, substantially in real-time and on-line. The present invention includes flowing a carrier solution through a carrier solution channel separated from a sample channel by a membrane. A component of the carrier solution is diffused through the membrane into the sample channel to stabilize trace metals in the solution sample for subsequent analysis. Simultaneously, the matrix is eliminated, neutralized, and/or modified for enhanced analysis.

A thick film electrochemical micro-sensor apparatus for detection and quantification of trace metal ions in water, comprising a substrate to which is applied an arrangement of electrodes comprising at least one of a first type of working electrode, at least one of a second type of working electrode, a counter electrode, a reference electrode, and optionally pH and temperature detectors. The apparatus is especially useful for detection and quantification of trace metal ions in water and effluent. A method of detecting and quantifying trace metal ions using the electrochemical micro-sensor apparatus is also described comprising contacting the water or effluent with the sensor of the present invention, applying a voltage selected for the trace metal ion to be detected, measuring the current output of the micro-sensor, determining if the current output indicates the presence of the trace metal ion, and generating a signal.

Methods for cleaning and regenerating a working electrode in an electrochemical cell; method for measuring the concentration of a metal in a liquid sample in an electrochemical cell having a working electrode, the method including a step for cleaning and/or regenerating the electrode; and an assembly having an ultrasonic device in sonic communication with an electrochemical cell.

The invention discloses a method of detecting heavy metal lead, cadmium, arsenic and copper in a TCM (Traditional Chinese Medicine) tablet. The method comprises the following steps: after carrying out microwave alkaline hydrolysis on tablet powder with an ammonia chloride containing diluted alkali solution, quickly adding hydrogen peroxide containing dilute acid solution, and ultrasonically extracting after the pH value is adjusted to be not more than 2; carrying out constant volume on an extract after the centrifugation, condensation and microfiltration; and finally, determining by adopting an atomic absorbency method. According to the method, a sample is preprocessed by an alkaline-hydrolysis acid-extracting method, therefore, the loss of heavy metal element caused by high temperature of a dry ashing method and air pollution and potential danger caused by a resolution method can be prevented; meanwhile, the method has the advantages of being good in recovery rate, high in precision, fast in processing speed, convenient to operate, wide in range of application and the like, and is more suitable for the quantitative determination of trace metal elements.

The invention relates to an ICP-MS measuring method of trace metal impurities in high purity lead, which adopts a high-purity nitric acid dissolving sample and uses the electrolytic method to remove lead in the high purity nitric acid dissolving sample, and utilizes inductive coupled plasma mass spectrometer and adopts peak jumping mode to scan and test blank, work-curve standard solution and sample elements to be detected so as to obtain the content of the elements to be detected. The ICP-MS measuring method of trace metal impurities in high purity lead is convenient in operation and can effectively eliminate matrix effect caused by excessively high total solid content and avoid pollution during the preparation process of samples, thus greatly reducing memory effect and obviously increasing measuring accuracy. The ICP-MS measuring method of trace metal impurities in high-purity lead is applicable to the analysis and testing of the content of a plurality of trace metal impurities.

The present invention relates to a cosmetic or pharmaceutical composition to reduce skin damage caused by aging and/or the environment. The composition can include a genus Centipeda plant extract, a trace metal source in a skin absorbing form in an amount effective for activating or enhancing superoxide dismutase enzyme, and a carrier suitable for topical administration. The compound may alternatively include a genus Centipeda plant extract and a low molecular weight transporter and an ion-pair delivery system including a donating composition and an accepting composition, wherein the donating composition and the accepting composition are combined to form a bound ion-pair, and a carrier suitable for topical administration.

The invention discloses a preparation method of a biogas fermentation accelerant. The fermentation accelerant comprises trace metal elements such as Fe, Co, Ni and Zn. The preparation method comprise the following steps of preparing a thick salt solution in a chloride form; adding quantified thick salt solution into a fermenting methane pool every day, then stirring for well mixing the metal elements in fermentation liquor. The accelerant has good effect for biogas fermentation taking cow dung, pig manure and sheep manure as raw materials, and has good immediate effect on methanogens in biogas fermentation; if the accelerant is added in biogas fermentation, the methane yield can be improved and the methane content of the methane can be improved, the removal rate of COD (chemical oxygen demand), TS (thymidylate synthase) and VS can be obviously improved, and the accelerant has good prospect for promotion and application of the biogas fermentation.

The invention provides a trace metal element chelation fertilizer in lignin and application thereof. The trace metal element chelation fertilizer in the lignin is a mixture of lignosulfonate and metal element chelates and shows the following physical-chemical characteristics of: 1, appearance: white powder; and 2, stability parameters of chelate: the average coordination number x is between 0.9 and 1.95 and the stability constant 1gK is between 0.6 and 2.10; and 3, the metallic chelation rate is 10 to 13.55 percent. The lignosulfonate-metal element chelation fertilizer is prepared by performing oxidative modification reaction on paper-making waste liquid lignosulfonate and metal elements such as iron, zinc and copper which serve as raw materials, and the chelation property of lignin ammonium is quantitatively described by measuring the stability of the chelates of lignin ammonium-Fe and lignin ammonium-Zn. The industrial lignin and the metal elements form the 'lignin-metal elements' chelates, and the obtained chelates are dried to form solid products or the obtained chelates after proper concentration can be mixed with other kinds of fertilizers to prepare various compound fertilizers.

The invention relates to a fiducial marker having a marking grid that is used to correlate and view images produced by different imaging modalities or different imaging and viewing modalities. More specifically, the invention relates to the fiducial marking grid that has a grid pattern for producing either a viewing image and/or a first analytical image that can be overlaid with at least one other second analytical image in order to view a light path or to image different imaging modalities. Depending on the analysis, the grid pattern has a single layer of a certain thickness or at least two layers of certain thicknesses. In either case, the grid pattern is imageable by each imaging or viewing modality used in the analysis. Further, when viewing a light path, the light path of the analytical modality cannot be visualized by viewing modality (e.g., a light microscope objective). By correlating these images, the ability to analyze a thin sample that is, for example, biological in nature but yet contains trace metal ions is enhanced. Specifically, it is desired to analyze both the organic matter of the biological sample and the trace metal ions contained within the biological sample without adding or using extrinsic labels or stains.

The invention discloses a preparation method of novel compost and relates to the field of preparation of agricultural fertilizer. The preparation method comprises: mixing sludge generated by sewage treatment and animal excrement; adding attapulgite and biomass charcoal; adding humic acid and waste vinasse; finally, adding auxiliary materials and spraying mixed bacterium liquid; adding mature earthworms and maturing compost; sieving; finally, detecting and packaging. According to the preparation method provided by the invention, the sludge and the animal excrement are treated by adopting a microorganism aerobic composting manner, so that harmlessness and recycling are realized; the earthworms are introduced in a treatment process, and the sludge, the animal excrement and the earthworms supplement one another; benefit maximization of fertilizer production is realized; loosening and digestion of the sludge and the animal excrement can be carried out through movement of the earthworms; a digestive treatment capability of a bacterium agent sprayed on the sludge and the animal excrement under aerobic conditions is enhanced; meanwhile, the earthworms, which are dead at a high-temperature condition, can also be used as fertilizer; the earthworms can absorb trace metals including mercury, lead, cadmium and the like in soil and the earthworms can be used for eliminating environmental pollution to a certain extent.

An electrolytic method and apparatus for treating a solution sample allowing for the accurate and substantially real-time and on-line analysis of trace contaminants in the solution sample. The method of the present invention includes two stages. The solution sample is electrolyzed during a first stage to decompose the matrix, thereby substantially neutralizing the matrix, while during a second stage deposited or precipitated metals are recovered and/or stabilized in solution. An apparatus for carrying out the method is also disclosed.

The invention relates to an ICP-AES detection method for trace element content in a lead concentrate. The trace elements comprise copper, zinc, cadmium, tin, antimony, iron, aluminum, manganese, titanium, nickel, chromium and cobalt elements. The objective of the invention is to solve the problems that the detection of multiple metal elements in the lead concentrate is not accurate, specially themeasurement for the content of the trace metal elements is not accurate. The method comprises the steps of: preparing a sample solution; preparing a working curve standard solution of copper, zinc, cadmium, tin, antimony, iron, aluminum, manganese, titanium, nickel, chromium and cobalt, measuring the mass concentrations of the sample solution and a blank test solution; and calculating the contentof the copper, zinc, cadmium, tin, antimony, iron, aluminum, manganese, titanium, nickel, chromium and cobalt elements according to formulas. The measurement result is accurate, the detection range islarge, the content of multiple trace elements is accurately measured, and the ICP-AES detection method can be widely applied to official testing institutions or third-party detection.

The invention relates to a method used for raising the output of marsh gas by using anaerobic fermentation of organic effluent water, which pertains to the technical field of biological treatment of effluent water. The invention adopts simulated organic effluent water or practical wastewater from chemical industry as treatment objects, by adding trace metal element Co and metal ion chelating agent to an anaerobic reactor to improve the biological availability of trace metal elements which are essential for methanogen and promote the growth and activity of methanogen, thereby, methane output and transformation efficiency of contaminating material of the system is improved. The method needs only extreme micro-amount of trace metal element Co and metal ion chelating agent, therefore, the invention is not only convenient to be manipulated with high efficiency and but also low in cost which leads the invention to be extensively applicable in engineering practice.

The present invention provides a method for preserving cells and nucleic acids in a sample by exposing the sample to a composition that causes an inhibitory affect on proteolytic agents and/or nucleic acid degradative agents in the sample. Such compositions that are useful in the method of the present invention include chelating agents such as sodium citrate, sodium borate, sodium fluoride and EDTA, that will bind trace metals necessary for proteolytic activity of proteolytic agents and/or nuclease activity of nuclease agents in a sample.

A method and device for measuring a trace metal ion concentration are provided. The method includes S1) according to absorbance in a full waveband of a solution including a trace metal ion, acquiring an optimum wavelength zone in the full waveband by utilizing a root mean square error of prediction; and S2) acquiring an effective wavelength point for measuring the concentration of the trace metal ion in the optimum wavelength zone through a correlation coefficient process. Through adoption of an interval-correlation coefficient partial least squares process, sensitive zones of high-concentration matrix ions and a blank information zone are rapidly and efficiently removed, wavelength points which are high in nonlinearity, low in information quantity and masked by matrix ions are rejected, complete usable information of the trace ion to be detected is maintained to the utmost, interferences of the high-concentration matrix ions on the trace ion to be detected are reduced, sensitivity of the trace ion to be detected is maintained, the number of variables is reduced, and precision and real-time performance of a model are improved.

The invention discloses a separated purification method and the application thereof of a polycyclic aromatic hydrocarbon anaerobic degrading pure strain, which belongs to the polluted soil and aqueous biological degradation handling field. A base bottom layer flat plate is manufactured in the a anaerobic box filled with nitrogen gas by taking polycyclic aromatic hydrocarbon as a sole carbon source and an energy source and taking sodium nitrate or potassium nitrate as an electronic accepted anaerobic agar solid culture, the top layer flat plate of the anaerobic agar solid culture including polycyclic aromatic hydrocarbon anaerobic degrading mixed bacteria is manufactured on the bottom layer flat plate, the manufactured culture medium flat plate is put in a drying container filled with the nitrogen gas to culture one to two months after being sealed. Polycyclic aromatic hydrocarbon, electronic acceptance, basic culture medium, trace metal liquid, vitamin c solution and colony in the culture medium flat plate connected into the anaerobic bottle of resazurin are added in the anaerobic box filled with the nitrogen gas, and are cultured for 20 to 25 days in an oscillator under the temperature of 20 plus or minus 2 DEG C and the rotating speed of 100 r / min. Then, the cyclical switchover is performed, after a cycle time is larger than four times, the pure strain of the anaerobic degrading polycyclic aromatic hydrocarbon can be obtained. The method can obtain good microbe pure strain to the polycyclic aromatic hydrocarbon anaerobic degrading performance by being separated.