نتایج جستجو برای: کادمیم cadmium
تعداد نتایج: 24850 فیلتر نتایج به سال:
River water used to irrigate arable land in Dayu County, Jiangxi Province, China, is polluted with cadmium from tailings and the wastewater of tungsten ore dressing plants. From information about the date of construction of ore dressing plants and an analysis of the annual growth rings of trees, we deduced that local residents have been exposed to cadmium for at least 25 years. Cadmium exposure...
The feasibility of using ion-exchange resins to separate cadmium from tellurium in acidic solutions of the two metals was investigated. We studied the competitive adsorption of cadmium and tellurium in such resins under varying acid strengths and contact time. We found that low sulfuric acid strength (i.e., 0.5 M) was most effective in removing cadmium from solutions. Different ion-exchange res...
استفاده مجدد از ضایعات آلی مانند لجن فاضلاب، روش مناسبی برای باز گرداندن مواد آلی و برخی عناصر غذایی به خاک بهشمار میرود. قبل از کاربرد ضایعات آلی تعیین احتمال انباشت فلزات سنگین در خاک و آلودگی زنجیره غذایی انسان و حیوان در نتیجه کاربرد این ترکیبات، الزامی است. هدف از انجام این پژوهش گلخانهای، تعیین اثر لجن فاضلاب شرکت پلیاکریل بر غلظت کادمیم شاخساره ذرت و مقایسه آن با کودگاوی و نمک معدنی ...
A 28-year-old female presented for evaluation of left flank pain and polyuria after having been exposed to cadmium in the jewelry manufacturing industry for approximately 3 years. This patient possessed both elevated 24-hr urinary ss2-microglobulin and elevated blood cadmium levels. Approximately 6 months after initial presentation, the patient resigned from her job due to shortness of breath, ...
Cadmium is a ubiquitous environmental metal contaminant with an affinity for biological membranes; it can enter cells by facilitated transport and it binds therein to various biomolecules and affects membrane system function. The relationship between cadmium exposure, dose and response was investigated in the benthic, deposit feeding, marine bivalve Tellina deltoidalis, using 28 day microcosm s...
Pretreatment with cadmium is reported to protect animals, to some extent, from acute toxicity of a following administration of a higher dose of cadmium itself. On the other hand, it is still unknown as to whether or not the teratogenicity and/or the fetolethality of cadmium are reduced by such pretreatment with cadmium. Based on Cadmium Pretreatment and Fetotoxicity of Cadmium 287 a report that...
Cadmium accumulation by the haemolymph, gills and carapace of the shore crab Carcinus maenas (L.) was significantly higher in dilute sea water. This was reflected in the whole-body cadmium concentrations. There was no salinity effect with the hepatopancreas or muscle cadmium concentration. Over a 68-day period, cadmium was steadily accumulated by the carapace, with the salinity effect becoming ...
هدف از این پژوهش، مطالعه جذب سطحی کادمیم بر روی نانوپودر سیلیکای تثبیت شده در آلژینات کلسیم و تعیین ایزوترم، سینتیک و ترمودینامیک جذب بود. از راکتورهای جریان ناپیوسته برای بررسی تأثیر ph اولیه، زمان تماس و غلظت یون های فلزی بر جذب کادمیم استفاده شد. زمان تماس و ph اولیه مطلوب برای جذب سطحی کادمیم به ترتیب 120 دقیقه و 4 به دست آمد. با افزایش غلظت یون کادمیم از 10 به 1000 میلی گرم در لیتر، میزان ...
BACKGROUND In Mae Sot District, Tak Province, Thailand, the paddy fields receiving irrigation from the two creeks and crops grown in the areas were found to contain markedly elevated cadmium levels during the surveys in 2001-2004. OBJECTIVE The present report carried out a survey in 2004 to determine urinary cadmium, a good index of excessive cadmium exposure and body burden, among the expose...
Cadmium (Cd) is a well-known human carcinogen and a potent nephrotoxin. The protective effects of alpha-lipoic acid and melatonin against cadmium (Cd) induced oxidative stress to erythrocytes in rats were evaluated. One hundred male albino rats were divided into five groups containing 20 rats each. Group I: (control) administered distilled water. Group II :( Cadmium exposed group) received cadm...
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