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Dołączył: 29 Paź 2010
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 Wysłany: Czw 6:40, 30 Gru 2010 Temat postu: tiffany schmuck Copper-MTB-CTMAB-β-CD system of c |
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Copper-MTB-CTMAB-β-CD research and application of the color system
Buffer solution pH. The results show that,[link widoczny dla zalogowanych], pH value of 8.58 - 10.10 when the maximum absorbance of the complex and stable,[link widoczny dla zalogowanych], experimental use pH = 9.5 of N-NH,[link widoczny dla zalogowanych], tCI buffer solution 4mL. (3) the amount of color reagent. Experiments show. MTB in the 3 ~ 4.5mL maximum absorbance when the stable complex. Experiment used 0.05% MTB4mL. (4) the amount of surfactant. I% CTMAB amount of time in the 0.4 ~ 1.5mL maximum absorbance and stability of the complex, experimental use 1% CTMAB0.5mLd () time and color stability. Color instantaneously to basically remain unchanged in the 12h. (6) working curve. By the work of experimental methods to draw curves of copper and copper content in the O ~ 50gg/25mL law is obeyed between, apparent molar absorption coefficient ? = 1032 × 10L ・ mol of a 1 ・ cm_. . '(7) interference test. For copper 40,[link widoczny dla zalogowanych],25 mL,[link widoczny dla zalogowanych], and the relative error <± 5% the amount of ions allowed (in mg total) Ba2 (2.35), Co (0.07), Ni (0.025), Pb (0. 11), c, (1.. 0), Bi ¨, Mn (0.015), FeH (0.002), Al, n (0.004), Mg (0.0o38). sr2 (0. , Zn (0.005), Ca2 (0.045). 3 samples of 3.1 sample preparation (1) green bean sample: Wash the green beans to take a sample in the crucible after ignition add 1:1 HCl solution. With 1mo1. LNaOH adjusted to pH = 5.0 or more, 100mL volumetric flask quantitatively transferred to a constant volume of water. (2) Water: Wash 1000mL water bottle to take a stand trial. 3.2 Determination of Ha spiked samples back to collect the sample solution 5mL in 25mL volumetric flask, followed by addition of 2mL1% F a, 2mL1: 10 ethylene glycol, 2mL1: 10 triethanolamine, the following experimental method was determined by absorbance results shown in Table 1. Decline a determination results Tab111t ~ sultofm'n ~ edetemliutkmr61 sample bean 23.97401529.0510l6 water 24.45371529.53101.724.45296l03448100.32445517l53997103.4
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