Table 2. Methodology for determining F-, Ag and pH in the samples.
|
Variables |
Dilutions |
Methods |
Equipments |
|---|---|---|---|
|
% Fluoride in HF |
Group 1 1:5.000 Group 2 1:50.000 |
Visible Spectrophotometry |
Ultraviolet-visible (UV-vis) spectrophotometer Brand: Hach Model: DR 2010 Serial number: 990800015058 Wavelengths: 580 nm |
|
% Silver in AgNO3 |
group 1 1:100.000 group 2 1:500.000 |
Atomic Absorption Spectrophotometry |
Atomic-Absorption Spectrophotometer Brand: Buck Model: VGP-210 Serial number: 333 Ionization method: Air-acetylene |
|
pH |
˗ |
Potentiometry |
pH meter Brand: SANXIN Model: SX 711 Serial number: 111071535 |