Development of an unmanned device with picric acid strip for on-site rapid detections of sodium cyanide in marine water

Abstract

In this study, a rapid detection method using picric acid test strip for detection of sodium cyanide in ocean water was established, and an automatic-integrated detection device was set up, which can be mounted on an unmanned surface vehicle. The optimal detection conditions were set as follows: for a 100-ml seawater sample, the weight of tartaric acid solid was 1.5 g, 1–2 drops of 150 g/L sodium carbonate were used to soak the picric acid test strip, the heating temperature was 80 °C, and the heating time was 5 min. Under the optimal conditions, the test result was satisfactory and the detection limit of the method achieved was 0.3 mg/L. This method realizes the remote and rapid detection of sodium cyanide in seawater, which greatly improves the detection efficiency and does not require any personnel to enter the contaminated site. It can be widely used for rapid detection scenarios such as leakage accidents from overseas transportation, lake pollution emergencies and on-site screening.

Effect of Doping TiO2 NPs with Lanthanides (La, Ce and Eu) on the Adsorption and Photodegradation of Cyanide—A Comparative Study

“…The adsorption thermodynamics and kinetic behavior of cyanide adsorption were investigated using 500 mL of water containing 20 mg L −1 of KCN [ 38 ]. The alkaline picrate analytical method was used to quantify total cyanide in aqueous solutions [ 39 , 40 , 41 ]. To accomplish this, first, the alkaline picrate solution (PAS) was prepared, consisting of 1 g of picric acid ((O 2 N) 3 C 6 H 2 OH) and 5 g of sodium carbonate (Na 2 CO 3 ) dissolved in 200 mL of HPLC water.…”

Comparative Study of the Effect of Doping ZnTiO3 with Rare Earths (La and Ce) on the Adsorption and Photodegradation of Cyanide in Aqueous Systems

“…The alkaline picrate method [ 92 , 93 ] was used with some modifications to quantify total cyanide. To prepare the alkaline picrate solution, 1 g of picric acid and 5 g of sodium carbonate were dissolved in 200 mL of HPLC water.…”

Cyanide Removal by ZnTiO3/TiO2/H2O2/UVB System: A Theoretical-Experimental Approach

“…The alkaline picrate analytical method was employed to quantify the total cyanide content in aqueous solutions [76][77][78]. In this method, an alkaline picrate solution (PAS) was prepared, consisting of 1 g of picric acid ((O 2 N) 3 C 6 H 2 OH) and 5 g of sodium carbonate (Na 2 CO 3 ) dissolved in 200 mL of HPLC-grade water.…”