A Novel Optical Sensor for Determination of Thiocyanate

Abstract

A novel optical sensor (optode) is described for the determination of thiocyanate using methyltrioctylammonium chloride immobilized on triacetylcellulose membrane. The response to thiocyanate is the result of adsorption of [Co(SCN) 4 ] 22 on sensing membrane, which caused the colorless membrane to change to blue. This optode can readily be regenerated by using 0.02 mol/l sodium oxalate solution. The linear range of the method was 3.44 Â 10 25 to 8.61 Â 10 24 mol/l of thiocyanate with a limit of detection 1.51 Â 10 25 mol/l. The relative standard deviation for eight replicate measurements of 8.61 Â 10 25 and 4.30 Â 10 24 mol/l of thiocyanate was 3.45 and 1.23%, respectively. The sensor was successfully applied for the determination of thiocyanate in saliva of smokers, nonsmokers and various water samples.

The Analysis of Cyanide and its Breakdown Products in Biological Samples

“…The determination of cyanide, thiocyanate, ATCA, and cyanide-protein adducts in biological fluids and tissues is useful for forensic, clinical, research, law enforcement, and veterinary purposes. Methods of analysis include spectrophotometry (37,59,62,74,78,81,89,90,93,105,120,130,133,139,141,143,, fluorescence (49,51,89,115,121,132,142,(175)(176)(177)(178)(179)(180)(181), chemiluminescence (77,109), electrochemistry (18, 56, 63-65, 68, 69, 73, 75, 79, 80, 106, 129, 138, 153, 182-197), gas chromatography (GC) (45, 53, 54, 61, 91, 95, 103-105, 107, 108, 111, 113, 114, 117, 119, 121, 125, 126, 128, 131, 135, 137, 152, 198-212), liquid chromatography (LC) (34,40,49,52,66,67,72,92,94,109,110,…”

An optical chemical sensor for thorium (IV) determination based on thorin

“…As mentioned in previous works [19,20] the hydrolyzed cellulose film in ethylenediamine shaped the porous structure in the polymer, which minimizes barriers of mass transport.…”

“…Because of their transparency, the polymers are most often used in optodes with visible spectrophotometric detections. The most widely used polymers in optical sensors are polyvinyl chloride (PVC) [14][15][16] and cellulose derivatives such as acetylcellulose [17][18][19][20]. Many factors must be controlled for preparation of a good optode based on a PVC membrane, particularly the solubility parameter of additives [21], whereas, the optical sensor based on acetylcellulose is prepared easily in a short time.…”

A two-in-one device for online monitoring of direct immersion single-drop microextraction: an optical probe as both microdrop holder and measuring cell

“…28 and ow injection [34][35][36] systems. Potentiometric sensors with different membranes 37,38 as well as optical 39,40 and colorimetric 41 sensors have also been reported. However, the number of microextraction methods is limited.…”