Determination of potassium ions in biodiesel using a nickel(II) hexacyanoferrate-modified electrode

A technical evaluation of biodiesel from vegetable oils vs. algae. Will algae-derived biodiesel perform?

“…Accordingly, some reports exist on determining heteroelements in biodiesel. [40][41][42][43][44][45][46] The major components of vegetable oils are triacylglycerols (triglycerides), the esters of glycerol with FAs. Generally, five FAs are commonly found in different amounts in most vegetable oils in the triacylglycerols of commodity vegetable oils, namely palmitic (hexadecanoic; C16:0), stearic (octadecanoic; C18:0), oleic (9(Z)-octadecenoic; C18:1), linoleic (9(Z),12(Z)-octadecenoic; C18:2), and linolenic (9(Z),12(Z),15(Z)-octadecenoic; C18:3) acids.…”

Metal and metalloid determination in biodiesel and bioethanol

“…Other alternative techniques have been MIP-OES, 158 ionic chromatography, 159,160 capillary electrophoresis 161,162 and voltammetry. [163][164][165][166][167][168] Flame Atomic Emission Spectrometry (FAES) could be considered as a low cost alternative for the determination of the four major elements (Ca, Na, K and Mg) in biodiesel samples. Alkalines are easily and efficiently atomized in ames.…”

“…A mercury lm electrode was used by Martiniano et al 164 to determine directly and simultaneously Pb 2+ and Cu 2+ . De Souza et al 167 used a nickel hexacyanoferrate-modied electrode for K + . The modi-ed electrodes exhibited a linear response in the concentration range of 4.0 Â 10 À5 to 1.0 Â 10 À2 mol L À1 , with a detection limit of 1.9 Â 10 À5 mol L À1 .…”

Interrupting the flux of delocalized electrons on a dibenzo-18-crown-6-embedded graphite sheet and its relative counteraction in the presence of potassium ions

“…In Table 2, the linear range and detection limit of the proposed sensor are compared with those of previously reported potassium sensors. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] It can be clearly seen that the electrode investigated in this study is significantly improved over previous reported works.…”