عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
شماره کتابشناسی ملی
شماره
TLpq303896413
زبان اثر
زبان متن نوشتاري يا گفتاري و مانند آن
انگلیسی
عنوان و نام پديدآور
عنوان اصلي
Bioavailability of cadmium in municipal sewage sludge
نام عام مواد
[Thesis]
نام نخستين پديدآور
J. Jing
نام ساير پديدآوران
T. J. Logan
وضعیت نشر و پخش و غیره
نام ناشر، پخش کننده و غيره
The Ohio State University
تاریخ نشرو بخش و غیره
1990
مشخصات ظاهری
نام خاص و کميت اثر
317
یادداشتهای مربوط به پایان نامه ها
جزئيات پايان نامه و نوع درجه آن
Ph.D.
کسي که مدرک را اعطا کرده
The Ohio State University
امتياز متن
1990
یادداشتهای مربوط به خلاصه یا چکیده
متن يادداشت
Seventeen sludges were selected based on their Cd and P content. These sewage sludges were obtained directly from waste water treatment plants with total Cd contents ranging from 0.07 to 2.02 mmol/kg and were extracted by three methods using a sludge-to-solution ratio of 1:5. The extractants employed were: 0.05 M Ca(NO3)2, 0.05 M Ca(NO3)2 containing 5 usd\timesusd 10 M Na-EDTA, and 1 g Chelex 100 resin. Cd was speciated using the computer program, GEOCHEM, after measuring the major cations and ligands in the extraction solutions. Extractable Cd and Cd species were compared with Cd uptake by sudax, a sorghum x sudan hybrid (Sorghum bicolar, L. (Moench)), which was started in pots of acid-washed quartz sand. After the roots completely penetrated the sand, the pots were placed on soil/sludge mixtures containing 1.25 and 2.5 mg Cd. Uniform plant growth was maintained with a neutral nutrient solution specifically developed for grass growing in sand. Plant tops were harvested 6 weeks after transplanting and analyzed for total Cd. Paired comparisons across all three extraction methods gave a uniformly high correlation (R2 usd\congusd 0.97). Cd concentration in plants increased with Cd rate but the slopes were different for different sludges. Cd uptake was positively correlated with total sludge Cd concentration (R2 = 0.46), and with Cd extracted with Ca(NO3)2 (R2 = 0.91), with Ca(NO3)2 containing EDTA (R2 = 0.94), and with resin (R2 = 0.92) extraction. No single Cd species gave as high a correlation to plant uptake as the total Cd concentration in that extraction solution. A correlation between Cd uptake and Cd/P showed that, as the sludge P content increased, the bioavailability of Cd decreased. Resin extraction, which gives a strong positive correlation, is recommended as a highly reliable and convenient method for estimation of Cd bioavailability for routine analyses.
موضوع (اسم عام یاعبارت اسمی عام)
موضوع مستند نشده
Agricultural chemicals
موضوع مستند نشده
Earth sciences
موضوع مستند نشده
Environmental science
موضوع مستند نشده
Geochemistry
موضوع مستند نشده
Health and environmental sciences
موضوع مستند نشده
Pure sciences
نام شخص به منزله سر شناسه - (مسئولیت معنوی درجه اول )
مستند نام اشخاص تاييد نشده
J. Jing
مستند نام اشخاص تاييد نشده
T. J. Logan
دسترسی و محل الکترونیکی
نام الکترونيکي
مطالعه متن کتاب وضعیت انتشار
فرمت انتشار
p
اطلاعات رکورد کتابشناسی
نوع ماده
[Thesis]
کد کاربرگه
276903
اطلاعات دسترسی رکورد
سطح دسترسي
a
تكميل شده
Y
