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First derivative fluorescence determination of selenium in tea

Good 2 Experimental 2.1 Instruments and reagents Hitachi 850 fluorescence spectrophotometer. Electric water bath incubator. pH or acidity. Selenium 1 a l9 to sulfuric acid. 2 + lHNOHC10 mixed units acid, 2,3 - Tb-based recommended (DAN1 grid solution: j5l = 200mgDAN in 300mL Erlenmeyer flask with a stopper. Plus 01mol/LHCI200mL cover shake 15min. Dissolved into the separating funnel, extracted with cyclohexane 3 to 4 times. each 2OmL. will be purified DAN was stored in brown bottle clean backup. Disodium EDTA has - Taiwan hydroxylamine hydrochloride mixed solution of cresol red, take 70g/LEDTA twitch limitless 100mL, 100g / L hydroxylamine hydrochloride solution of cresol red indicator 8mL 5OmL.02giL after mixing units. determined that the water pit 1000nIL.1_-1HN · H0 grid solution. Se standard fig Lang i0mg / L and 0Lmg./L22 Instruments working conditions, the first derivative fluorescence spectroscopy. excitation cross death lack 377.8Ilm. launch cross} lack 522Dil). Passband EX5nn. EM5nm scanning speed l2onm/min. Response speed 0.5s. Photomultiplier tube gain of mid-range. Emission filter 430nil), recording SEQ. Lg samples taken 23 samples digested in 50mL arms fire, plus l-l9 hit selenium sulfate 10mL. Slow to be wet sample plus 2 after ten 1HNO. HC10 20mL mixture of asbestos furnace placed online digestion. At this point a moment after a heated reaction solution from yellow to colorless and appear white Kuo. Continue heating until the solution turned yellow-green shield cooling off, but do try Jing test blank and standard solution of selenium in the digestive transit 24li setting method, reagent blank {Rong, Ho Rang Se standard series placed 5OmL colorimetric tube, the added EDTA solution stick Taiwan 20mL, with a ten lNHH. Chiang Hui-hydraulic control was 0 red orange (pH15 ~ 2.4) were the next steps in the dark dark room, add DAN solution 2In | mix,[link widoczny dla zalogowanych], cover measures to groan l stopper placed Fushui cooling heating 5rain adding 5mL of each ring hexane, shake 1mln extension to be stratified according to the determination of 22 pieces of equipment such as blank samples and standard solution of selenium derivative spectrum. And calculate the amount of selenium in the ancient. 3 Results and discussion 3.1 the choice of experimental conditions, the choice of acidity of the sample by mixed acid digestion goblet Taiwan Taiwan selenide materials to turn when the ring valence ions, in acidic conditions, nitrous F naphthalene and 2.3 generation network platform 4, Well kohlrabi 5 benzene brain pH1.5 ~ 24 Se Se contact Taiwan Sheng high intensity physical labor, the best stability, l2h remain long with the corresponding excitation turbid Qi continuous shooting 8rnin, contact Matt solution sets matter phenomena ( 2) Contact table and draw the selection in the acid conditions of selenium and DAN mixed sets things home dry boiling water} scoop,[link widoczny dla zalogowanych], respectively, remain 2 ~ 8min react alum given results show that the reaction of 4 ~ 6m [n Se Xu Qi fluorescence intensity to achieve the best too values and almost constant. Selected heating time is 5rain (3) guide the work of Respect the conditions established by fluorescence spectroscopy choose conventional fluorescence excitation wavelength of 3778nm determination of selenium in the hair wave 5:92 nn-Tan Ji tame wax application be reported even when the tea leaves,[link widoczny dla zalogowanych], there is 485nm and the impurity peak 5l92z1m signal peak overlapping of the results of pre-determination is not subject to a degree of impact I din ah. After a cartridge re-test. ... Order derivatives with respect fluorescence, the excitation wavelength to 377.8lSVfl. Refuse letter was a long shot is the peak-q522nrtl (negative peak 535nm) and impurity signals are peak 485nm (negative peak of a I99nm) are completely separated in order to remove the impurities,[link widoczny dla zalogowanych], drying determination of interference, and samples through the standard derivative of l AD = ... a account for calculating the amount of selenium. . 2 linear. Fortunately, poison green standard curve and limit the expense of picking up the standard addition method curve: Code Southern regression equation was determined to go abroad and hinder the phase stool constricted end of r-_09996. A =: 51.31 Ten .1144 results Derivative Fluorescence Determination of selenium in the O ~ 10mg / L range was a good line to take the standard invasive SUI relations are curves and curves of the base ring hollow boat plus cars parallel to the statutory standard calibration can be used tea Selenium in (2j method Island quiet limited degree phase picking: Ukraine surprised by this method of listless and intraoperative results of Curculigo {t Selenium accuracy is good. the relative standard deviation less than 5. cloth method detection limit for the 013.ug refuse / l. Meng light sensitive than arm spy law 33 times higher】 channeling project received the experimental method Oolong Xiao, tea cents for recycling operation Experiments to determine the results of the recovery of the Q 34 95.4 103 determination results obtained 5 Ye Zhu Rong commercial approach with the yellow line derivative method for the determination of selenium content are 0181 ~ 0355tlgfg. the right approach for their products pool corruption Determination of selenium in 1995, readers are 12 Received; 19951n23 scratch by
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