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Adsorption of Cu(II) and Ni(II) ions onto the waste powdered activated sludge biomass (PWB), which was obtained from the biological wastewater treatment plant, was investigated in this experimental study. The effects of contact time, pH, temperature, initial sorbate and sorbent concentrations on the adsorption were determined. The BET surface area, pore volume, and pore diameter of PWB were found to be about 0.51 m2/g, 0.0053 cm3/g, and 41.4 nm, respectively. Considering the R2 value, qexp and qcal, the Langmuir and Freundlich models were well described for Cu(II) and Ni(II) adsorption, respectively. The adsorption mechanism of Cu(II) and Ni(II) onto the PWB could be better simulated by the pseudo-second-order kinetic mechanism than the pseudo-fi rst-order, intra particle diffusion and Elovich models. Thermodynamic aspects of the adsorption of heavy metals were also investigated. Considering the applied desorbing agents for reuse of PWB for Ni(II) recovery, desorption cycle is not feasible due to the deterioration of the PWB structure.

GirişArsenik (As) ile kirlenmiş yeraltı suları içme ve kullanma suyu olarak kullanılmasının yanında, sulama suyu olarak da kullanılmaktadır. As içeren su ile sulanan bitkiler, doğrudan insanlar tarafından tüketilmekte veya bu bitkilerin otcul hayvanlar tarafından tüketilmesi ile besin zinciri yoluyla insanlara ulaşmaktadır. Özellikle As ile kirlenmiş toprak ve yeraltı suyunun bulunduğu bölgelerde yaşayan insanlar arseniği bünyelerine beslenme yoluyla (su, bitki ve hayvansal gıda) almaktadır. En yüksek güvenli As alım seviyesi (içme suyundan ve besinlerden) orta yaştaki bir erkek için 220 mg/gün olarak tanımlanmıştır [1].İçme suyunda, As derişiminin kısıtlanması ile As giderimine yönelik araştırma sayısında artış olmasına rağmen ülkemizde, içme ve kullanma suyu kaynaklarında, As kirliliği araştırmaları oldukça sınırlı sayıdadır. Atropojenik (yapay) yollarla sular, As kirlenmesine maruz kalırken, jeotermal kaynaklı suların kullanımı ile de su kaynaklarında As kirlenmesi belirlenmiştir. Doğal ve yapay yollarla As kirlenmesine maruz kalan toprak ve sulama sularının tarımsal amaçlı kullanımı ve etkileri hakkında ülkemizde çalışma bulunmamaktadır.Hayvan beslenmesinde temel gıda maddeleri olan hayvan yemi ve suyun kalitesi hakkında araştırmalar oldukça sınırlıdır. Hayvansal ürünlerde (et, sakatat ve süt) biriken kirleticiler (özellikle ağır metaller) besin zinciri yoluyla insanlara

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18595 Background: In this study, we described four new cases of bisphosphonates-related jaw osteonecrosis and reviewed the English Medical Literature for similar case reports. Methods: A MEDLINE literature search was performed from September 2003 to November 2005 for all case reports of bisphosphonates-associated jaw osteonecrosis. Results: Our patients were three female and one male with a median age of 50.5 years (range, 35–57 years). Two patients had breast cancer and two another had multiple myeloma. Two patients received pamidronate initially and were switched later to zoledronate. The two other patients were treated with zoledronate. The median duration from the first administration of bisphosphonates to the diagnosis of osteonecrosis was 48 (range, 18–75) months. Review of the literature of all published cases revealed 184 patients. Age of these patients ranged from 37 to 89 years (median, 64 years). Seventy-eight patients (43.4%) were treated with bisphosphonates for metastatic breast carcinoma, 65 (36.3%) for multiple myeloma, and 14 (7.8%) for metastatic prostate cancer. Thirteen patients (7.2%) without cancer diagnosis were treated for osteoporosis (10 patients) or Paget’s disease (3 patients). Primary disease was not specified in five patients. Eighty-two patients (46.8%) were treated with pamidronate, 47 (26.8%) treated with zoledronate, 35 (20%) treated with pamidronate initially and later were changed to zoledronate, 9 (5.1%) treated with oral bisphosphonates and 2 (1.1%) treated with oral bisphosphonates initially and subsequently switched to zoledronate. Type of bisphosphonate was not specified in ten patients. The duration of bisphosphonates treatment was available for 45 patients (24.4%) and ranged from 1 to 93 (median, 28) months. Conclusion: Oncologists and dental professionals should be aware of this potential serious complication of long-term bisphosphonates treatment and special caution should be taken before dental intervention in such patients. No significant financial relationships to disclose.

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