Conductivity were measured with the inoLab Cond 720 conductometer
(2004), and it was measured in a 20% (w/v) solution of stingless bee honey in distilled water using a digital conductometer
Molar conductance in ~[10.sup.-3] M DMSO solution was recorded using an Elico Cm-180 conductometer
. UV-visible spectra of the prepared complexes in the region 200-800 nm were recorded using a double beam spectrophotometer (ELICO SL 117) with 1cm quartz cuvettes.
The conductivity of the suspension was measured upon titration with 0.1 M aqueous NaOH solution, using a conductometer
. The measurements were repeated three times for each sample.
Molar conductance was measured by a DDS-11A conductometer
. XRD pattern was recorded on a D/max-II X-ray diffractometer in the diffraction angle range of 5-80[degrees].
The room temperature molar conductivity of the complexes in MeOH, EtOH, and DMSO solutions (0,001 mol x [L.sup.-1]) was measured using a deep vision 601 model digital conductometer
. The X-band EPR spectrum was performed at LNT (77 K) using TCNE as the g-marker.
pH measurements were performed in the laboratory with a pH electrode and the EC with a WTW laboratory conductometer
. Bicarbonate was determined by titration with HCl.
The molar conductance of the complexes was measured using freshly prepared 10-3 M solutions in electrochemically pure DMF at room temperature, using a Conductometer
Moisture content was determined using a honey hand refractometer (Honey Tester 68-92% No 600048 meopta), pH and free acidity were determined by titration to pH 8.3, and electrical conductivity was determined using a HANNA DIST2 hand conductometer
. Color was determined according to the White  method, based on the Pfund indicator calculation.
The temperature, pH, and electrical conductivity were measured by using Thermometer, pH meter and Conductometer
20 Minutes later, residual content of metal ions was determined on the KFK-3-01 conductometer
(LLK ZOMZ, Russia) with use of the photometrical method [26, 27].