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| Temat postu: mbt uk Chemiluminescence determination of liquid s |
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Chemiluminescence determination of liquid selenium
e concentration, △, luminous intensity and the blank value for the difference.) Is calculated, the detection limit of 2.3 × 10rnI_ (measured in 3s). Se of 1.0 × 10g/mE the determination of 11 consecutive iv solution, the relative standard deviation is 3.5%. 3.3 Influence of foreign ions to 1.0 × lO 100 times the F, c0], c,, s I, 10 times the H, 0.01mol / L of Br a, N Xin,[link widoczny dla zalogowanych], Si A, sO {a,[link widoczny dla zalogowanych], P 'do not interfere, the selectivity of this method. 4 samples of tea, Determination of selenium in human hair: the tea leaves are pulverized, sieved, washed and dried hair back. accurately weighed sample 1.00 (3Og in a small beaker with a small amount of water to wet, add 1 : 4 of the HC10,[link widoczny dla zalogowanych],. HNO3. To avoid the loss of wet digestion, selenium, while adding 11 412 Analytical Chemistry Volume 28 ragCu2 stability Jing. mixing slowly after the regulator on the furnace heated to the sample is completely dissolved and evaporated to near dryness . After cooling, add (1 +1) H2SO ~ 20mL residue dissolved and transferred to separatory funnel. NA.1.5gKBr (first with a small amount of water-soluble), 3mLHO4 shake,[link widoczny dla zalogowanych], add 25mL of benzene, shaking 1min. stratification the water phase into another separatory funnel, add 25mL of benzene re-extraction time. The combined organic phase was extracted twice with 20mL water reverse. Taiwan and the aqueous phase in 50mL volumetric flask, dilute to the mark with distilled water. in accordance with the experiments were determined, and for the standard addition recovery experiment, the results shown in Table 1. Table 1 tea and determination of selenium in human hair results Table1Detenninatic ~ r Miao Shan ofseleniuminteaandhair sample analysis showed that this method is relatively simple, rapid, high accuracy and selective, with satisfactory results. Rer coffee Ioesl ): 522YeYI.qi fan g (Ye Yuqiong), № Well Yun (~ Yun) Physla ~ cries of coffee where the db which d convex curved body BChen ~ ca / where d (Physical Testing and Chemical Analysis), 1995.3l (4): 242 ~ 2453xuHl | i (Xu Hui), HePing (He Ping) West,. Aria /. convexity. (analytical chemistry), 1999,27 (5): 5411 ~ 542LiquidS} mJimhan (plus delete the jack hiss, Hebe / Normalr duh y Which 0500 ~ 6) ) AbstractAnewmethodforthedeterminationoftraceseleniumisproposedtmsedonthecatal ~ Jcactionofselenlum which co-cl-hu ni feeding - Financial reactionu6li2iI】 gchemiluminescencereactionofLwithlm'mnolaS, indicatingreaction.Thedetectionliraitis23 × 10mL.Thelinearran identified ofcalibrationcurveis1.0 × 101.0 × 10 ~ g / mE.Thismethodis ~ imph, rapidandaccuracyIthaeenappHedtothedetem6natlonoftr ~ ceseleniuminteaandhairwithsatisfactoryresudts.Key ~ rdsChemilunfinescence, tuminol, selenium (Received151) emm ~ laer1999; cystatin call-10 called y2OOO)
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