نتایج جستجو برای: ion
تعداد نتایج: 205620 فیلتر نتایج به سال:
a pvc ion-selective membrane electrode based on cd-tetraphenyl porphyrine as a carrier was prepared fordetermination of mno4- ion. this electrode revealed good selectivity toward permanganate ion over a widevariety of anions. effects of some experimental parameters such as nature of the plasticizer, the amounts ofcarrier and additive, and concentration of the internal solution on the potential ...
objective: the objective of this study was to investigate the invitro fluoride release of four new self-adhesive resin cements; set (sdi, australia), breeze (pentron, usa), embrace wetbond (pulpdent, usa), g-cem (gc, japan) and to assess the bonding performance of these self-adhesive resin cements for bonding of orthodontic brackets. materials and methods: for fluoride release experiment, six ...
a rapid isocratic method of high performance liquid chromatography system (hplc) with a glassy carbon working electrode of electrochemical detector is set up for quantitative detection of trace amount of nitrite ion (no2¯) in aqueous protein containing cell lysate, cell media, plasma, serum, urine and other body fluids. the solid extraction reversed phase cartridges (sep-pak) are used for dep...
the adsorption of lead (11) and copper (11) in a fixed bed column using activated carbonprepared from nipa palm nut was investigated. thomas model and yoon and nelson kinetic models were used to analyze the column performance. the rate constant for thomas model increased with increase in flow rate and initial ion concentration but remained constant at varying bed height. adsorption capacity for...
in present research work, homogeneous anion exchange membranes based on polysulfone (qapsfs) were prepared via chloromethylation, amination and alkalization. in amination step, trimethylamine and n,n,n',n'-tetramethyl-1,6-hexanediamine were used as amination and crosslinking agents, respectively. the chloromethylated polysulfone was characterized by 1hnmr spectroscopy and chloromethylation degr...
جداسازی و تلخیص آنزیم لیزوزیم از سفیده تخم مرغ و بررسی برخی اثرات باکتریولیتیک آن درمحیط کشت .آنزیم لیزوزیم طی مراحل مختلف به روش کروماتوگر تبادل یونی ion exchange chromatography از سفیده تخم مرغ تهیه و خالص گردید. فعالیت لیزوزیم تهیه شده با افزودن آن به سوسپانسیونی از باکتری میکروکوکوس و اندازه گیری تغییرات جذب نور توسط اسپکتروفتومتر مورد ارزیابی قرار گرفت . باتزریق لیزوزیم تجارتی طی چند مرحله...
در این رساله به بررسی طیف رامان نقایص ایجاد شده در نانولوله های کربنی چند دیواره بمباران شده با آرگون در دز و انرژی های مختلف پر داخته شده است نمونه ها با انرژی 3-50 kev و دز ion/cm2 1017×3 و1018×3 وخلا torr6 -10 بمباران شدند. به منظور بررسی اثر بمباران ار آنالیز های میکروسکوپ الکترونی روبشی و پایداری حرارتی و رامان استفاده شده است و همچنین مقاومت سطحی نمونه ها با تکنیک چهار پروپ نقطه ای اندازه...
Ion pair dispersive liquid- liquid microextraction (IP-DLLME) method combined with flame atomic absorption spectrometry was proposed for the determination of trace amounts of copper(II). By using pyrocatechol violet as chelating agent and cetyltrimethyl ammonium bromide as an ion pairing agent, the trace amount of copper(II) was extracted in chloroform. The factors influencing the formation cop...
Potentiometric investigation on {H2O+NaNO3+PEG1500} mixtures were made at T=308.15K, using electrochemical cells with two ion-selective electrodes, (Na+ glass) as the cation ion-selective electrode against (NO3- solvent-polymer PVC) as the anion ion-selective electrode. The mean ionic activity coefficients of NaNO3 were measu...
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