Abstract:
Electrodeposition baths, systems and methods are provided. In some embodiments, the baths, systems and methods are used to deposit metal alloy coatings.
Abstract:
an x-ray fluorescence spectrometer (52); and a sample holder (2) for the x-ray fluorescence (XRF) spectrometer (52), wherein the sample holder (2) comprises: an electrically conductive synthetic diamond electrode (4) providing a front surface (6) on which chemical species can be electro- deposited from a solution (48) comprising the chemical species; an ohmic contact (8) disposed on a rear surface of the electrically conductive synthetic diamond electrode (4); and an electrical connector (10) which is connected to the ohmic contact (8), and wherein the x-ray fluorescence spectrometer (52) comprises: an XRF sample stage (58) configured to receive the sample holder (2); an x-ray source (54) configured to apply an x-ray excitation beam to the chemical species electro-deposited on the electrically conductive synthetic diamond electrode (4) when the sample holder (2) is mounted to the XRF sample stage (58); an x-ray detector (60) configured to receive x-rays emitted from the chemical species electro-deposited on the front surface (6) of the electrically conductive synthetic diamond material when the sample holder (2) is mounted to the XRF sample stage (58); and a processor (62) configured to generate x-ray fluorescence spectroscopic data based on the x-rays received by the x-ray detector. Such system allows to carry out simultaneously and in-situ stripping voltammetry measurements together with X-ray fluorescence measurements.
Abstract:
An electrochemical sensor comprising: a reference electrode (4) formed of an electrically conductive synthetic doped diamond material and configured to be located in electrical contact with a solution (8) to be analysed; a sensing electrode (2) formed of an electrically conductive synthetic doped diamond material and configured to be located in contact with the solution (8) to be analysed; an electrical controller (10) configured to conduct stripping voltammetric measurements by applying a voltage to the sensing electrode (2), to change the applied voltage relative to the reference electrode (4), and to measure an electric current flowing through the sensing electrode (2) thereby generating voltammetry data; and a calibration system configured to provide an in- situ calibration for providing a reference point in the voltammetric data since the potential of the diamond reference electrode is non fixed and floating. Consequently, assigning of peaks (M1, M2, M3) in the voltammetry data to chemical species (M1, M2, M3) is possible, thereby allowing the type and concentration of chemical species in the solution (8) to be determined. The in-situ calibration consists of: 1 - using a spectrometer for X-rays, Gamma rays or fluorescence measurements integrated in the sensor, 2 - using a known redox couple added to the solution that will provide a reference peak in the voltammetric data, or 3 - producing in-situ ionic species at the vicinity of the reference electrode.
Abstract:
The present invention provides a method for measuring a substrate concentration by accumulating an energy resulting from a reaction between a biocatalyst and a substrate recognized by the biocatalyst to a certain level; and using a dependency of an accumulation rate on the substrate concentration as an index; and a apparatus therefor. In particular, the present invention provides a method in which the measurement of the accumulation rate is carried out by measuring a frequency of an energy release in a certain amount of time when the energy accumulated in the capacitor reaches the certain level and is then released.
Abstract:
The invention provides an apparatus for sequentially analyzing a plurality of samples containing electrochemically active substances, said apparatus comprising: a sample conduit (10); an electrochemical flow cell (20); a source of carrier fluid (30); a structure elucidation spectrometer (40) (MS or NMR); a conduit (60) and an in-line sample reservoir (50) (e.g. a sample loop), wherein the apparatus is arranged to operate in: a) a first operating modus wherein the sample conduit (10) is connected to the conduit (60) via the electrochemical flow cell (20) and the in-line sample reservoir (50), and the source of carrier fluid (30) is connected to the spectrometer (40) by-passing the in-line sample reservoir, and b) a second operating modus wherein the sample conduit (10) is connected to the conduit (60) by-passing the in-line sample reservoir, and the source of carrier fluid is connected to the structure elucidation spectrometer (40) via the in-line sample reservoir (50).
Abstract:
The invention is a method, system and software application for electrochemical analysis of analytes in a solution. In one aspect of the invention, raw data is received from an electrochemical analysis and the raw data is analyzed. The analyzed data and the raw data are displayed. The electrochmical analysis is performed by applying one or more time-sequenced voltage waveforms in the soution and measuring the resulting current in the solution. In one aspect of the invention, the raw data is received from the electrochemical analysis wherein the raw data is representative of the measured current parameters. The raw data may be integrated based on one or more integartion time intervals, and the raw data may be displayed in one or more three dimensional plots. The integrated data and the raw data may also be displayed in one or more two-dimensional plots. The raw data is stored for three dimensional displays and the integrated data is stored for two dimensional displays. Baseline correction is performed on the raw data and the baseline corrected data is displayed in one or more three dimensional plots and in one or more two dimensional plots. The raw data is transmitted and stored at a rate between 100 Hz and 10 KHz.
Abstract:
The invention relates to an apparatus for measuring the calcium oxalate scale forming propensity of a continuously flowing solution having a pH of from 2 to 3 which comprises a quartz crystal microbalance having a top side comprising a working electrode for exposure to the solution and a bottom side isolated from the solution, wherein the working electrode is coated with or made of a conductive material on which the intensive evolution of hydrogen gas proceeds at potentials more negative than necessary to achieve a pH of 3.5-9 proximate to the microbalance.
Abstract:
This invention is directed to a method and apparatus for measuring the rate of calcium oxalate scale formation in a continuously flowing solution having a pH of from about 2 to about 3 comprising measuring the rate of deposition of calcium oxalate scale from the solution on to a quartz crystal microbalance having a top side and a second, bottom side isolated from the solution, wherein the pH of the solution proximate to the microbalance is measured using a pH measuring module and is controlled electrochemically at from about 3.5 to about 9 and wherein the working electrode (23) is coated with or made of a conductive material on which the intensive evolution of hydrogen gas proceeds at potentials more negative than those necessary to achieve a pH of 3.5-9 proximate to the microbalance (2).
Abstract:
A method and apparatus to analyse metal or metal ion content of a sample having a pre-determined volume comprising the steps of: generating a voltage, applying the voltage to the sample; detecting current flow as the voltage is applied to the sample; detecting a peak current (Ip) and corresponding voltage potential (Ep) from the applied voltage; selecting a metal present in the sample according to the values obtained by the peak detection means and the information from a metal database. Preferably a screen printed electrode is used to measure soil samples. The invention can conveniently measure metal contamination in soil samples on site.