Activity measurements with a fluoride-selective membrane electrode

Srinivasan, K.; Rechnitz, G. A.

doi:10.1021/ac60259a039

Cited by 73 publications

(17 citation statements)

References 10 publications

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“…This electrode gives Nerstian response to fluoride ion concentrations from above 1M to below 10 -5 M, and only OH -seems to interfere with this response. Srinivasan and Rechnitz [ 32 ] noted that stirring sometimes had a substantial effect on the observed potential. In 10 -3 M NaF solution, the potential changed from -61.5 mV in a quiescent solution to -55.5 mV in a rapidly stirred solution.…”

Section: Fluoride Electrodementioning

confidence: 99%

Determination of Fluoride and Chloride Contents in Drinking Water by Ion Selective Electrode

Bratovčić¹,

Odobašić²

2011

Environmental Monitoring

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Section: Fluoride Electrodementioning

confidence: 99%

Determination of Fluoride and Chloride Contents in Drinking Water by Ion Selective Electrode

Bratovčić¹,

Odobašić²

2011

Environmental Monitoring

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“…İdrar örneklerinde flor düzeyleri iyon selektif elektrot kullanılarak potansiyometrik olarak belirlenmiştir (8,26). İdrar örneklerinde flor düzeyleri ölçümünde "Total Ionic Strength Adjustment Buffer -TISAB" kullanılmıştır.…”

Section: Materyal Ve Metodunclassified

Florozisli koyunlarda serum lipid profili

Sanem;FİDANCI¹

2011

Ankara Üniversitesi Veteriner Fakültesi Dergisi

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In sera of the animals' triglyceride, total cholesterol and high density lipoprotein levels were determined. Very low density lipoprotein and low density lipoprotein levels were calculated from an equation. In conclusion, as a consequnce of raise in triglyceride, total cholesterol, VLDL-C and LDL-C fraction (p ≤ 0.05) lipid profile was altered. In HDL-C levels no significant changes was observed (p ≥ 0.05). Similarity of altered lipid profile in both renal failure and chronical florosis made us think that these results were because of kidney damage due to high floride levels.

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“…2 The calculations were performed by an iterative procedure in which initial values of unity were taken for all J;; approximate solutions for eqs (3) and (5) and their substitution into eq (4) yielded an approximate value of J which was then used to obtain Ji from eq (6).…”

Section: Calculative Proceduresmentioning

confidence: 99%

“…a nd it is a fun cti on ofte n used inion associati on s tudi es [3,16]. Th e te rm fi"is a n alternative definition 111-volving th e equilibrium co ns tants KI and / (2, (15) Th e weights of th e observ ables we re calculated from…”

Section: Least Squares Procedures For Estimation Of the Equilibrium Comentioning

confidence: 99%

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Ionization of hydrofluoric acid at 25 C

Patel¹,

Moreno²,

Patel³

1971

J. RES. NATL. BUR. STAN. SECT. A.

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Th e io niza ti on co nstant, K" fo r th e reacti on HF:;:2 H + + F -was ca lc ul ate d on th e ba s is of pote nti o· metric me as ure me nt s in th e cell Ag; AgCl , CI -, F -II La F"II Na F, HC I, 1-1 , 0 1 KC I(Sa td .), I-I g,Cl 2 ; Hg at 25°C. A leas t s qu a res procedure wa s a ppli e d to th e ex pe rim e nt a l da ta yie ldin g a bes t es tim a te fo r K, of 5 .85 X 10 -4 with a s ta nd a rd e rror of 0.03 X 10 -" . Key word s : H ydro flu ori c ac id ; ioni za ti on c onst ant ; lanth a num flu orid e e lec t rode; le as t s quares pro· ce d ure; potenti ome tri c me as ure me nt s . . IntroductionThe ch e mical properties of dilute aqueo us soluti ons of hydrofluori c ac id are described [1 , 2, 3] J by th e equilibria (1) (2) in wh ic h pare ntheses indi c ate ac tiviti es of th e various c he mical species. Mos t of the evid e nce for th e pres· e nce of th e variou s s pecies involved in th e above equilibria has been obtained from s tudi es [3,4] at hi gh co nstant ion ic stre ngth s. Unfo rtun a tely, the values for the apparent equilibrium co ns tants derived from s uc h studies are of limited use.Th ermodyn a mi c valu es of K J and K2 have bee n reported on th e basis of pote ntiome tric [5 , 6] or conductance meas ure me nts [7] . However, there are uncertainties in th e valu es of the constants originating from the graphical approximations [5 , 6] used in the calculation s, or from the assumptions regarding the species res pon sible for the transport of c urrent [7].The prese nt investigation was prompted by the observation of s mall but consistent discre pan cies between the valu es of fluoride ion activities obtained with Ce nt e r, Bos lon, Ma ss. 02 100. t Fi gures in b rac ket s ind ica t e t he lit e ratu re re re re nces at th e e nd of thi s paper.a lanthanum Auorid e me mbran e electrode and those calculated on the basis of th e re ported ionization constants of hydroAuori c a cid. Pote ntiom etri c meas ureme nts were mad e in th e ternary syste m aF-HCl-H20 . The use of th e th ermodynamic value of KJ d erived from such meas ure ments elimin ated th e di screpanc y betwee n meas ured a nd calc ulated Au orid e ion activiti es. Th e leas t squares procedure used in th e present study obviates the un certa int ies inh ere nt to gra phi cal me thod s and permits th e es timation of e rrors on a so und stati sti cal basis. Experimental Methods and Procedures . 1. NaF-HCI-H20 SystemsAll the che micals used in the present study were reagent grade. Stock solutions of sodium flu orid e were prepared by weighing the salt whi c h was dri ed at 100°C for 24 h; the salt was dissolved with condu ctivity water in borosilicate volumetri c flas ks and immediately transferred to polye thyle ne bottles for storage. The systems used in th e potentiometric measurements were mad e by takin g 100 ml of sodium fluoride solutions of suitable conce ntrations and adding various aliquots of standard hydrochloric acid. In this way it was possible to obtain syste ms with a wide co ncentration ran ge in bo...

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Activity measurements with a fluoride-selective membrane electrode

Cited by 73 publications

References 10 publications

Determination of Fluoride and Chloride Contents in Drinking Water by Ion Selective Electrode

Determination of Fluoride and Chloride Contents in Drinking Water by Ion Selective Electrode

Florozisli koyunlarda serum lipid profili

Ionization of hydrofluoric acid at 25 C

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