Rhodamine 6G is a red or yellow-brown powder that dissolves in water, exhibiting a bright red-green-yellow fluorescence. In alcohol solutions, it shows a yellow-red color with green-yellow fluorescence. When the pH is around 3, rhodamine 6G forms a pink ion association complex with cerium and thiocyanate ions. The maximum absorption wavelength (Λmax) is 565 nm, with a molar absorptivity (ε) of 1.43 × 10³. The complex has a composition ratio of [Ru]:[HR]:[SCNâ»] = 1:3:6. A linear calibration curve was observed within a concentration range of 1–7 μg of ruthenium per 25 ml.
In the presence of phosphoric acid, several coexisting cations at weight multiples up to 500 do not interfere with the determination of ruthenium, including Ca²âº, Sr²âº, Ba²âº, Mg²âº, Be²âº, Pb²âº, Zn²âº, Cd²âº, Mn²âº, Ni²âº, Fe²âº, Fe³âº, Cr³âº, Al³âº, Bi³âº, La³âº, Tl³âº, As³âº, Asâ´âº, Thâ´âº, Ceâ´âº, Seâ´âº, Sbâµâº, and Uâ¶âº. Adding sodium fluoride before reagent addition prevents interference from Zrâ´âº and Wâ¶âº at weight multiples up to 500 during strontium analysis. After forming the ionic association, adding thiourea eliminates interference from Cu²âº, Hg²âº, Co²âº, Pd²âº, and Ptâ´âº at weight multiples up to 400 during bismuth determination. Rh(III), Os(VI), and Os(VIII) at 2.5 times the weight of the analyte may interfere with the determination.
The assay procedure involves adding 2.5 ml of 2% potassium thiocyanate and 2.5 ml of buffer solution to a 15 ml solution containing 1–17 μg of hydrazine. Adjust the pH to 3 if necessary, then heat on a boiling water bath for 20 minutes. Allow the solution to cool to room temperature, transfer to a 25 ml volumetric flask, add 5 ml of 0.005% rhodamine 6G in water, mix thoroughly, and add 1 ml of glue solution. Dilute to the mark with water, and measure the absorbance of the reagent blank at 565 nm using a 1 cm cuvette.
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