نتایج جستجو برای: k2cr2o7
تعداد نتایج: 127 فیلتر نتایج به سال:
زمینه و هدف: مطالعه حاضر با توجه به مخاطرات فراوان فلز سنگین کروم در محیط زیست از جمله سرطان پوست و ریه و آسیبهای کلیوی و کبدی با هدف بررسی حذف Cr(VI) توسط زئولیت های کلینوپتیلولیت از محلولهای آبی انجام پذیرفت. روش کار: دراین مطالعه از زئولیت های کلینوپتیلولیت با اندازههای cm4 برای حذف کروم شش ظرفیتی از آب استفاده شد. برای تهیه محلول کروم شش ظرفیتی از دی کرومات پتاسیم ((K2Cr2O7 و آب مقطر دوب...
سهم عمده ای از آب های زیر زمینی و زمین های مختلف جهان به علت پسماندهای واحدها ی صنعتی و فعالیت های کشاورزی آلوده می باشد. از فلز کروم در صنایعی مانند استخراج فلزات، آبکاری، تولید رنگ و رنگدانه ها و صنایع کاغذ سازی، استفاده وسیعی می شود. اغلب پسماندهای این صنایع در بسیاری نقاط سبب نشت یون سمی و کارسینوژن قوی cr6+ به خاک و سپس به آب های زیر زمینی می باشد. در این پژوهش میزان جذب و انباشتگی کروم در...
Pristine Antimony tungstate nanoparticles prepared via a simple hydrothermal process showcase interesting photocatalytic efficiency, degrading Methylene Blue (MB) completely in 180 min under visible light. In this study, the impact on crystalline quality and related optical properties as well efficiency of antimony due to temperature variation during synthesis are explored. While X-ray diffract...
The present review targets the comparative biogenic synthesis and mechanisms of nanoparticles using various plant-parts extracts solutions strong electrolytic metal salts. salts are AgNO3, Zn(OAc)2, Zn(NO3)2, ZnSO4, CuSO4.5H2O, Cu(NO3)2, Cu(OAc)2, CuCl2, HAuCl4.3H2O, Mg(NO3)2, Mg(OAc)2, TiO(OH)2, Fe(NO3)2.6H2O, FeCl3.6H2O, FeCl2.4H2O, Al(NO3)2, BaCl2·2H2O, Bi(NO3)2, PdCl2, H2PtCl6.6H2O, NaHSeO3...
Hexavalent chromium (Cr VI) is a highly toxic environmental pollutant produced as byproduct of stainless steel manufacture and leather tanning. Several vegetal Cr VI-accumulating species have been investigated in phytoremediation, promising technology to remove heavy metals from soils water bodies. The aim this work was test the sensitivity, accumulation remotion VI both life cycle phases fern ...
neospora caninum is a coccidian protozoan that causes abortion in dairy and beef cattle and neurological disorders in dogs and horses. to identify n. caninum oocysts in the dog feces the molecular approaches are known as sensitive methods that specifically detect the oocysts. in present study, a polymerase chain reaction (pcr) targeting n. caninum specific nc5 genomic fragment was performed to ...
Background and Aim: Common sources of chromium in wastewater are electroplating and leather industries. Thus, the present study aimed at investigating and comparing between chemical (H2O2) method and nano-photocatalytical(UV/ZnO) method in removing of Cr(VI) from polluted water. Materials and Methods: In this experimental-analytical study, effective factors on reduction process such as ZnO (0.0...
We studied whether arsenic, nickel, and chromium compounds that are human carcinogens could induce transformation of cultured primary human diploid foreskin cells (HFC). All nickel compounds tested, PbCrO<, K2Cr2O7, CrO3, Na2HAsO4, NaAsO2, and jV-methyl-A/'-nitro/V-nitrosoguanidine (MNNG) caused significant (p = 0.001) dose-de pendent inductions of anchorage-independent colonies in HFC. kl l.. ...
Chromium (Cr) is an abundant heavy metal in nature, toxic to living organisms. As it is widely used in industry and leather tanning, it may accumulate locally at high concentrations, raising concerns for human health hazards. Though Cr effects have extensively been investigated in animals and mammals, in plants they are poorly understood. The present study was then undertaken to determine the u...
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