A kind of detection method of calcium ion in seawater
A calcium ion and seawater technology, applied to measuring devices, instruments, scientific instruments, etc., to achieve the effects of simple operation, improved stability, and reduced workload
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Embodiment 1
[0027] Such as figure 1 The detection device shown: the ion-selective electrode 1, the reference electrode 6 and the auxiliary electrode 5 are respectively drawn by wires to the electrochemical workstation, and the electrochemical workstation is connected to the computer; the ion-selective electrode is composed of a polymer sensitive membrane, an inner filling liquid and an internal reference Composition of electrodes.
[0028] (1) Preparation of calcium ion selective electrode sensitive membrane: weigh 76mg polyvinyl chloride, 152mg o-nitrophenyloctyl ether, 25.6mg inert lipophilic salt tetrakis(dodecyl)-tetrakis(4-chlorophenyl) Ammonium borate (ETH 500) and 2.7 mg of N,N-dicyclohexyl-N′,N′-dioctadecyl-3-oxaglutaramide (calcium ionophore ETH 5234) were dissolved in 3.5 mL of tetrahydrofuran, After stirring evenly, fix it in a glass ring with an inner diameter of 3.6 cm on a glass plate. After the tetrahydrofuran volatilizes, use a puncher to cut a transparent film with a di...
Embodiment 2
[0034] Such as figure 2 The detection device shown: the ion-selective electrode 1, the reference electrode 6 and the auxiliary electrode 5 are respectively drawn to the electrochemical workstation by wires, and the electrochemical workstation is connected to the computer; the ion-selective electrode is composed of a polymer sensitive membrane, an inner filling liquid and an internal reference Composition of electrodes.
[0035] (1) Preparation of solid-state calcium ion selective electrode: Weigh 76mg polyvinyl chloride, 152mg o-nitrophenyloctyl ether, 25.6mg inert lipophilic salt tetrakis(dodecyl)-tetrakis(4-chlorophenyl)boronic acid Dissolve ammonium (ETH500) and 2.7mg N,N-dicyclohexyl-N′,N′-dioctadecyl-3-oxaglutaramide (calcium ionophore ETH 5234) in 3.5mL tetrahydrofuran, stir well A polymer-sensitive film was obtained. Pipette 10 microliters of poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid dropwise onto the glassy carbon electrode, let it dry at room temper...
Embodiment 3
[0040] (1) The same as the sensitive film in Example 1.
[0041] (2) The ion-selective electrode (1), the reference electrode (6), and the auxiliary electrode (5) are respectively connected to the electrochemical workstation as a detection device through wires (see figure 1 ) into the 10.0mM KCl solution, first measure the open circuit potential under the condition of zero current, and confirm that it is the baseline potential of the working electrode ( image 3 A); then according to the designed detection program, apply a cathode constant current of 4s 5 microamperes ( image 3 B), so that the ions to be measured in the solution are efficiently gathered on the polymer sensitive membrane of the working electrode, and finally the open circuit potential is applied for 120s according to the detection program design to make the working electrode spontaneously return to the initial baseline potential ( image 3 C); The potential change signal obtained when a constant current is ap...
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