کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
1173054 1491350 2016 6 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله ISI
Miniaturized and direct spectrophotometric multi-sample analysis of trace metals in natural waters
ترجمه فارسی عنوان
تجزیه و تحلیل چندنمونه اسپکتروفتومتری مستقیم و کوچک شده از فلزات کمیاب در آبهای طبیعی
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کلمات کلیدی
ردیابی فلزات؛ میکروآنالیز؛ جعبه Behnken؛ Cu؛ V؛ dPKBHdPKBH، di-2-pyridylketone benzoylhydrazone؛ مس، مس؛ V وانادیم؛ CDTA، 1،2-cyclohexanediaminetetraacetic acid؛ UV-Vis، اشعه ماوراء بنفش قابل مشاهده ANOVA، تجزیه و تحلیل واریانس؛ LOD، محدودیت تشخیص
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی

Trends in the analysis of trace metals in natural waters are mainly based on the development of sample treatment methods to isolate and pre-concentrate the metal from the matrix in a simpler extract for further instrumental analysis. However, direct analysis is often possible using more accessible techniques such as spectrophotometry. In this case a proper ligand is required to form a complex that absorbs radiation in the ultraviolet–visible (UV–Vis) spectrum. In this sense, the hydrazone derivative, di-2-pyridylketone benzoylhydrazone (dPKBH), forms complexes with copper (Cu) and vanadium (V) that absorb light at 370 and 395 nm, respectively. Although spectrophotometric methods are considered as time- and reagent-consuming, this work focused on its miniaturization by reducing the volume of sample as well as time and cost of analysis. In both methods, a micro-amount of sample is placed into a microplate reader with a capacity for 96 samples, which can be analyzed in times ranging from 5 to 10 min. The proposed methods have been optimized using a Box–Behnken design of experiments. For Cu determination, concentration of phosphate buffer solution at pH 8.33, masking agents (ammonium fluoride and sodium citrate), and dPKBH were optimized. For V analysis, sample (pH 4.5) was obtained using acetic acid/sodium acetate buffer, and masking agents were ammonium fluoride and 1,2-cyclohexanediaminetetraacetic acid. Under optimal conditions, both methods were applied to the analysis of certified reference materials TMDA-62 (lake water), LGC-6016 (estuarine water), and LGC-6019 (river water). In all cases, results proved the accuracy of the method.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Analytical Biochemistry - Volume 497, 15 March 2016, Pages 18–23
نویسندگان
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