What's more, we establish a system for determining potassium ions with RLST. In the B-R buffering solution, the reaction of Potassium and sodium tetraphenyl borate can form a scattering system which will greatly increase the intensity of Resonance light scattering.
A kind of lidocaine drug FETS by the combination of ion sensitive field effect transistor (ISFET) and drug sensitive membrane was developed with sodium tetraphenyl borate as electric active materials,DBP as plasticizer with 5% of PVC of tetrahydrofuran solution deposited on the ISFET gate area.
TTPB was determined by potentiometrically titrating excess sodium tetraphenyl borate with TTPB,using a saturated calomel electrode as reference and a [BF 4] - ion-selective electrode as indicator in Na 2CO 3-NaHCO 3 buffer solution. The optimum conditions were determined.
EVALUATION OF THE UNCERTAINTY OF MEASUREMENT IN THE DETERMINATION OF POTASSIUM CONTENT IN POTASSIUM CHLORIDE BY SODIUM TETRAPHENYLBORATE GRAVIMETRIC METHOD
Determination of potassium in the production of complex fertilizer was described by titration of trimethyl hexadecyl ammonium bromide with excessive sodium tetraphenylborate.
The influencing factors of the uncertainty of measurement in the determination of potassium content in potassium chloride using sodium tetraphenylborate gravimetric method are discussed and the components of the uncertainty of measurement in the testing are analyzed and calculated. The standard uncertainty and the expanded uncertainty of potassium reported are 1. 7×10 and -3. 4×10-3 respectively, and the measurement results were expressed.
The C_(12)-2-C_(12)·2Br selective membrane electrode was prepared using a deposit of C_(12)-2-C_(12)·2Br and sodium tetraphenylborate as the electrical active compound and PVC as the membrane material. Over the range of 15～45 ℃,the detection limit for C_(12)-2-C_(12)·2Br was 1.5×10~(-6) mol·L~(-1).
以四苯硼酸钠与季铵盐Gem in i表面活性剂(C12-2-C12.2B r)生成的沉淀物质作为电活性物质制备选择性膜(PVC)电极,在所考察的15~45℃内,膜电极对C12-2-C12.2B r水溶液的检测下限浓度为1.5×10-6mol.
The coordination reaction of sodium tetraphenylborate with four 4-phenylpolyenio acyl benzo 15-crown-5 and a phenyl acyl benzo 15-crown-5 forked conjugative compounds in 80% ethanol solution at 26℃ has been studied by thermal measurement.
Sodium tetraphenylborate (Na TPB) is added to precipitate pefloxacin and ciprofloxacin in HAc NaAc buffer solution (pH=4.8). After filtering, the excess of TPB in the filtrate was titrated by substituting CTMAB standard solution, which was used instead of poisonous thallous sulfate as titrant. The disappearance of the incision of TPB on d E /d t=f(E ) curve was used to indicate the end point of the titration.
Palladium catalyzed cross-coupling of symmetrical diaryliodonium salts with sodium tetraphenylborate in water
Solubility of sodium tetraphenylborate in solutions of NaCl, Na2NO3, Na2SO4, NaCl+MgCl2 at 25°
Conductance data are presented for sodium tetraphenylborate (NaBPh4) in three solvent systems: water-dimethyl sulfoxide, water-acetone, and acetone-dimethyl sulfoxide.
Ion pairing in solutions of sodium tetraphenylborate
The addition of sodium tetraphenylborate (NaTPB) and various plasticizers viz.
The direct amperometric titration of amines with sodium tetraphenylborate solution based upon anodic depolarization at a dropping mercury electrode by the use of excess TPB titrant, was systematically investigated. The influence of various factors such as pH, volume of titration mixture, quantity of sample in a definite volume to be titrated were studied. Based upon the above observations, a method is proposed as follows: Pipette 0.5-2.0 ml (at a concentration of about 2×10~(-2)M) of samples of various...
The direct amperometric titration of amines with sodium tetraphenylborate solution based upon anodic depolarization at a dropping mercury electrode by the use of excess TPB titrant, was systematically investigated. The influence of various factors such as pH, volume of titration mixture, quantity of sample in a definite volume to be titrated were studied. Based upon the above observations, a method is proposed as follows: Pipette 0.5-2.0 ml (at a concentration of about 2×10~(-2)M) of samples of various amines into a 50 ml beaker and add 1% HAc to make a volume of about 10-20 ml. The dropping mercury electrode serves as the polarographic anode. Titrate the amines with 0.05 M standard Na-TPB solution (pH 8) at 0.18 V using the saturated NaCl bridge and S.C.E. as reference. After each addition, stir for one minute and allow the solution to obtain a steady current value, then record the galvanometric reading. The end point is graphically plotted with current versus milliliters of titrant; sharp breaks are obtained. The Na-TPB solution was standardized volumetrically by the standard mer- curic solution. Organic bases so determined include aniline, methyl aniline, diethylamine, ephedrine hydrochloride, dimethylaniline, trimethylamine hydrochloride, triethylamine hydrochloride, urotropine, and tetraethylammonium iodide. The relative error of this method is 2%. The more soluble salts of aliphatic primary amines such as methylamine, ethyl- amine, n-butylamine, and even in the case of ephedrine hydrochloride could not be ac- curately titrated. The application of this method to titrate the amines depend largely upon the structure of the amines and the solubility of amine-TPB salts. This method was also successfully applied to titrate the nitrogen containing drugs such as chlopromarzine, cinchophene, quinine sulphate, atropine sulphate, antipyrine, aminopyrine, rivanol, and strychnine.
In this paper, it is shown that a c oscillopolarographic titration can be applied advantageously to titrate neostigmine methyl sulfate by sodium tetraphenylborate(NaTPB).NaTPB is added to precipitate quantitatively, neostigmine methyl sulfate from aqueous solution. Filter part of the mixture, and the excess of NaTPB in the filtrate is titrated by thallous sulfate standard solution, using the disappearance of the incision of NaTPB on dE/dt—E curve to indicate the end point of titrations. The recovery was...
In this paper, it is shown that a c oscillopolarographic titration can be applied advantageously to titrate neostigmine methyl sulfate by sodium tetraphenylborate(NaTPB).NaTPB is added to precipitate quantitatively, neostigmine methyl sulfate from aqueous solution. Filter part of the mixture, and the excess of NaTPB in the filtrate is titrated by thallous sulfate standard solution, using the disappearance of the incision of NaTPB on dE/dt—E curve to indicate the end point of titrations. The recovery was 99.3～100.2%. Ten determinations on the same samplegave a relative standard deviation of ±0.42%. The method is accurate, rapid and Simple, much superior to the official method adopted now.
A PVC membrane sodium ion-selective microelectrode based on a neutral carrier(ETH 1097)has been constructed. The tip diameters of around 2. 5μm as well as the selectivity coefficients in respect to K~+,Mg~(2+)and Ca~(2+)allow the intracellular measurement of sodium ion activities. The response is linear in the range 10~(-3)to 5×10~(-1)M Na~+ giving a slope of 58. 2 mV(25'℃). The performance of electrode plasticized by dibutylsebacate (DBS)has been compared with that of electrode plasticized by dioctylphthalate(DOP)....
A PVC membrane sodium ion-selective microelectrode based on a neutral carrier(ETH 1097)has been constructed. The tip diameters of around 2. 5μm as well as the selectivity coefficients in respect to K~+,Mg~(2+)and Ca~(2+)allow the intracellular measurement of sodium ion activities. The response is linear in the range 10~(-3)to 5×10~(-1)M Na~+ giving a slope of 58. 2 mV(25'℃). The performance of electrode plasticized by dibutylsebacate (DBS)has been compared with that of electrode plasticized by dioctylphthalate(DOP). The change in performance caused by adding sodium tetraphenylborate(NaTBP)or NaSCN to membrane has been studied. The sensitive membrane containing DBS and appropriate amount of NaTPB is suitable for intracellular measurements.
sodium tetraphenylborate
四苯硼钠
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