Potentiometry of effective concentration of polyacrylate as scale inhibitor

Fluorescent polyaspartic acid with an enhanced inhibition performance against calcium phosphate

“…Several analytical methods such as colorimetric, turbidimetric, potentiometric, fluorescent tracer and spectrometric techniques were used to determine the concentration [12]. Among them, the fluorescence spectroscopy has become a hot spot of present research due to a high sensitivity, a good selectivity and a wide linearity.…”

Synthesis and properties of novel fluorescent‐tagged polyacrylate‐based scale inhibitors

“…Therefore, an adequate monitoring of the polymer concentration is needed to minimize the consumptions of both scale inhibitor and water. 9 Along with conventional monitoring methods based on UV-vis or potentiometry, 9 the intensity of fluorescence emitted from a covalently bound to polymer tracer becomes a matter of choice. [10][11][12][13][14][15][16][17][18][19][20][21][22] An objective of the present work was to synthesize the four novel fluorescent-tagged scale inhibitors and to study their properties with an emphasis on an interaction with the background heavy metal ions, normally present in the cooling water.…”

Potentiometry of Anionic Polyelectrolytes by Quaternary Ammonium Ion‐Selective Electrode with Quaternary Ammonium Ion Added as Probe

“…The effect of pH on the potential response of ISE based on C 16 TMA þ ,TFPB À to PA is shown in Figure 3. Compared with the Cu probe method [22], there was practically no pH effect; a slightly smaller response observed at pH 7 is reasonably ascribed to partial protonation of PA. Both calibration curves measured from a dilute solution at 10 À6 mol dm À3 solution upwards and from a concentrated 10 À4 mol dm À3 solution downwards were equivalent; there found substantially no hysteresis.…”

“…For example, these salts at 10 À3 and 10 À2 mol dm À3 had À 44 and À 82% errors, respectively. Although such increase may be considered as interference in the determination of the total concentration of PA, it can also be expressed that the potential correctly reflects the free or nonconsumed concentration of PA, which is of practical importance [22].…”

“…We have recently succeeded in determining the free concentration of polyacrylate (PA, one of APEs having only carboxylate groups) by using Cu 2þ as a probe and a solidstate Cu-ISE as a detector and also in monitoring the scale inhibiting ability of PA [22]. There was an almost instantaneous potential response with a greater total potential change (at least À 150 mV for three decades of PA) and substantially no hysteresis.…”