Performance of flowing and quiescent free-diffusion junctions in potentiometric measurements at low ionic strengths

Harbinson, Terence R.; Davison, William

doi:10.1021/ac00147a002

Cited by 16 publications

(13 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The pH readings were too unstable to determine the baseline pH of the deionized water. This finding agrees with previous work from environmental chemists 16 that suggested that most commercial pH meters are unreliable in solutions with an ionic strength less than 1 mmol/l. This unreliability is associated with the liquid junction of the instrument.…”

Section: Discussionsupporting

confidence: 93%

See 1 more Smart Citation

The Effect of PVC Packaging on the Acidity of 0.9% Saline

Story

Thistlethwaite

Bellomo

2000

Anaesth Intensive Care

View full text Add to dashboard Cite

Intravenous fluids in polyvinyl chloride (PVC) packaging are known to be acidic. We proposed to determine the effect of PVC packaging on the pH of 0.9% saline solutions by comparing the predicted and measured pH of 0.9% saline equilibrated with atmospheric carbon dioxide and the measured pH of commercial solutions of 0.9% saline in PVC and polypropylene packaging. Calculation of pH was made from available physical chemistry constants and data. Measurement was made of the pH of 12 samples of prepared 0.9% saline equilibrated with atmospheric carbon dioxide. Comparison with the pH of seven commercial samples of saline in PVC packaging for intravenous use was undertaken. Further comparison was made between commercial samples of 0.9% saline in PVC or polypropylene packaging. The calculated pH of 0.9% saline was 5.61 at 20°C. The median pH of the prepared samples was statistically significantly less acidic than the median pH of the PVC packaged samples for intravenous use: 5.47 vs 4.60, P<0.05. The median pH of the PVC packaged saline was also statistically significantly more acidic than the pH of the polypropylene packaged saline: 4.62 vs 5.71, P<0.05. The acidity of the intravenous solutions of 0.9% saline packaged in PVC was much greater than expected and is only partially explained by dissolved carbon dioxide. This acidity could be a result of packaging in PVC.

show abstract

Section: Discussionsupporting

confidence: 93%

“…The pH of water with dissolved atmospheric carbon dioxide is also of interest to those investigating environmental water systems such as seawater or streams 12,16,17 . Davison and Woof 17 have calculated the expected pH of distilled water with dissolved atmospheric carbon dioxide to be 5.64 at 20°C.…”

Section: Discussionmentioning

confidence: 99%

The Effect of PVC Packaging on the Acidity of 0.9% Saline

Story

Thistlethwaite

Bellomo

2000

Anaesth Intensive Care

View full text Add to dashboard Cite

show abstract

“…These questions include influence and treatment of liquid junction potentials [56][57][58], preparation and stability of pH reference materials [41] or design of liquid junction devices [38,42,57], The advantages of the multiple-point calibration procedure compared to both NIST "bracketting procedure" [39] and BSI single standard calibration [58] have been summarized elsewhere [42]. A further advantage not mentioned is the possibility to obtain estimates for the precision of each individual pH determination by well-known statistics.…”

Section: Appendixmentioning

confidence: 99%

Chemometric and Statistical Analysis of Uranium(VI) Hydrolysis at Elevated U(VI) Concentrations

Meinrath

1997

Radiochimica Acta

View full text Add to dashboard Cite

26 UV-Vis spectra of U(VI) samples in the pH range 2.4 to 4.8 and U(VI) concentration range 6 · 10"' M to 2 · 10" 4 M in 0.1 M aqueous Perchlorate solutions are analyzed simultaneously by model free techniques, e.g. factor analysis, target rotation and non-parametric statistics. Within the investigated range of conditions, three factors only are found to be significantly contributing. UOHaq), (U0 2 ) 2 (0H)r and (U0 2 ),(0H)í are found as the relevant species. A single component spectrum of the (U0 2 )I(0H)Î species is derived with a molar absorption of ε, 5 = 474±7 1 mor' cm"' at the absorption maximum at 429.0 nm of the low-energy electronic transition of uranium(VI). The complete set of 26 spectra is simultaneously interpreted by Target Factor Analysis. The evaluated formation constants are lg K22 = -6.14,±0.08« of (U0 2 ) 2 (0H)r from 21 observations and lg K', 5 = -17.14 2 ±0.13" of (U0 2 ) 3 (0H)J from 14 observations. Owing to the importance of pH determination in evaluating thermodynamic data of hydrolysis species, a rigorous statistical approach to the evaluation of pH by a multistandard calibration procedure is chosen.

show abstract

“…We assume that the acid-base balance of pure distilled water is 7.0 at 25 ∘ C. However, in experimental measurements, researchers indicate the pH of pure water, which is much less than 7.0 [4,5]. Numerous studies identify the dissolution of the atmospheric carbon dioxide in water as the main cause for a decrease in the pH level of distilled water.…”

Section: Time Dependences Of the Acid-base Balance Of Pure Watermentioning

confidence: 99%

“…In [2,3], the temperature dependence of the acidbase balance of pure water in the interval (25-50) ∘ C was presented. It is shown that the acid-base balance of pure water decreases linearly from pH 7.0 at 25 ∘ C to pH 6.65 at 50 ∘ C. Definitely, theoretical calculations of the acid-base balance of pure distilled water show that its pH should be equal to 7.0 at 25 ∘ C. However, in experimental measurements researchers manifest the value of the acid-base balance of pure water, which is much lower than pH 7.0 [4,5]. Among the causes for the discrepancy between the theoretically calculated and experimentally measured values of the acid-base balance of pure distilled water, which can affect the pH of distilled water, is the presence of impurities, including salts, metals, and volatile organic compounds.…”

Section: Introductionmentioning

confidence: 99%

Нетривіальна Поведінка Показника Кислотно-Лужного Балансу Води Поблизу Температури Її Динамічного Фазового Переходу

Khorolskyi

Kryvoruchko

2021

Ukr. J. Phys.

View full text Add to dashboard Cite

Експериментально дослiджено показник кислотно-лужного балансу (рН) двiчi дистильованої води за температур (35,0; 40,0; 42,0; 45,0) ∘C залежно вiд часу, який пройшов iз моменту виготовлення бiдистиляту. У нульовому наближеннi залежностi показника кислотно-лужного балансу дистильованої води вiд часу можуть бути апроксимованi експоненцiйним законом. Враховано, що зменшення рН iз часом вiдбувається при контактi води з атмосферним повiтрям, унаслiдок чого у водi розчиняється вуглекислий газ. За температури Булавiна–Маломужа 42 ∘C спостережено значнi осциляцiї значень показника кислотно-лужного балансу води протягом вимiрювань, що дозволяє отримати тiльки усередненi значення рН. Залежнiсть змiни показника кислотно-лужного балансу дистильованої води вiд часу за температури 42 ∘C апроксимується лiнiйною залежнiстю. Iз певними застереженнями вiдзначено, що температурна залежнiсть коефiцiєнта детермiнацiї R2 за експоненцiйної апроксимацiї часових залежностей змiни показника кислотно-лужного балансу дистильованої води може мати мiнiмум, близький до температури Булавiна–Маломужа.

show abstract

Performance of flowing and quiescent free-diffusion junctions in potentiometric measurements at low ionic strengths

Cited by 16 publications

References 15 publications

The Effect of PVC Packaging on the Acidity of 0.9% Saline

The Effect of PVC Packaging on the Acidity of 0.9% Saline

Chemometric and Statistical Analysis of Uranium(VI) Hydrolysis at Elevated U(VI) Concentrations

Нетривіальна Поведінка Показника Кислотно-Лужного Балансу Води Поблизу Температури Її Динамічного Фазового Переходу

Contact Info

Product

Resources

About