Background.Unsound recycling of e-waste releases toxic metals into environmental media and has deleterious health consequences to humans as the transfer through food chain, direct contact inhalation.Objectives.This study assessed soil contamination with lead (Pb), copper (Cu), chromium (Cr), nickel (Ni) cadmium (Cd) arising from crude recycling.Methods.Forty-eight samples were collected vicinity high-, medium- low-activity operations in Ogunpa Ibadan, Nigeria well botanical garden University...

This study assessed heavy metals pollution of soil by slag from an automobile battery manufacturing plant in Nigeria to ascertain the potential danger they pose on environment. 84 samples were randomly collected at 0 - 15 cm and 30 depths premises uncontaminated site as control for both dry wet seasons. Samples analyzed lead, cadmium, chromium nickel using standard analytical methods. Lead level ranged 243 126000 mg/kg with about 98% all having levels higher than 400 permissible Pb soil....

Management of waste electrical and electronic equipment (WEEE) has recently attracted worldwide attention because high metal concentrations in them. Evolution toxic precious metals utilized WEEE can not only reflect the adventure eco-design, but also guide final recycling option. Pb, As, Cu, Au, Sn Ag were determined 10 composite samples printed circuit boards cathode ray tube televisions (TV-PCBs) that produced between 1980 2005. The obtained results indicated average all TV-PCBs - Cu: 10.6...

Toxic metals are usually added to children's toys improve/impact some intrinsic properties such as colour which attracts children. Some of the toxic have life-threatening potentials on children when ingested. There is no specific legislation in Nigeria that monitors and regulates limits toys. This study assessed total bio-accessible concentrations Pb, Cd, Cr, Ni, Mn imported low-cost plastic sold popular markets Ibadan, Nigeria. A 22 different were purchased subjected an indicative test for...

Background.Extracts from medicinal plants have been widely used in the treatment of public health ailments, however, may be grown polluted soil/water environments. Many these are harvested and processed by local illiterate natural healers other vendors an unhygienic manner. This results possibility contamination with potentially toxic metals environment.Objectives.This study evaluated concentrations lead (Pb), cadmium (Cd), chromium (Cr), nickel (Ni), copper (Cu) zinc (Zn) 25 samples...

Levels of Pb, Ni, Cr, Cu, Zn, and Cd in the glass screens (GS) printed wiring boards (PWBs) obsolete computer monitors (OCMs) were determined by flame atomic absorption spectrophotometry (FAAS) following standard digestion. Metal concentrations (mg kg−1) GS ranges (medians brackets): Pb ND – 3100 (46), 0.5–2.6 (0.8), Cr 18.7 (3.1), Zn 8.1–600 (37) PWBs kg−1): 34,600 ± 17,000, 11 9, 59 45, 15,900 7800, Cu79,000 22,600, Ni 3200 2500. In GS, levels six metals lower than their total threshold...

The potentials of tropical weeds namely, Nephrolepis biserrata, Panicum maximum, Eleusine indica, and Chromolaena odorata to accumulate lead (Pb) cadmium (Cd) from soil within the premises an automobile battery manufacturing company in Ota, south-western Nigeria, were explored. weed samples collected both wet dry seasons. Standard analytical methods employed collect, digest, analyze weeds. Lead levels for seasons ranged 1990–4870, 1090–1730, 4800–7890, 400–1210 µg g−1 weight (DW) biserata,...

Many developing countries either lack or have weakly enforced regulations on imported goods. A high percentage of low-cost jewelry items in Nigeria are from abroad. There is concern about the levels heavy metals present these products.The study examined lead (Pb), cadmium (Cd), chromium (Cr) and nickel (Ni) inexpensive purchased retail wholesale shops Ibadan metropolis, southwestern Nigeria.One hundred (100) assorted were digested dilute nitric acid solution followed by atomic absorption...

Waste printed circuit boards (PCBs) contain toxic metals at concentrations that could pose human and environmental threats if improperly disposed of. Also, PCBs are known to appreciable quantities of precious with economic value. This study investigated the levels Cu, Pb, Ni, Zn Cd in extracted from ten discarded laptops outlined trends can be drawn results. The were made by a world-wide leading original equipment manufacturer (OEM). whole disassembled enable extraction populated PCBs;...

Exports of used electrical and electronic equipment (UEEE) from richer countries into developing provide socio-economic benefits, but also contribute to the huge environmental health damages e-waste causes in these countries.

Effective kitchen-waste management has become a challenging task because of the unabated population growth, rapid urbanization, and inherent limitations traditional recycling technologies.The downstream application food-waste disposer devices is necessity, but their potential environmental impacts are concern.This study characterized Chinese fractions that were separated from source evaluated physicochemical properties at pollutant-distribution level.The samples kitchen waste collected...

Obsolete mobile phones form a major component of the e-waste stream. The Printed wiring boards (PWBs) are packed with economic and toxic metals. Regulatory bodies such as Restriction Hazardous Substances (RoHS) directives regulate amount these metals in electrical electronic equipment. This study is aimed at evaluating selected critical present PWBs three popular brands discarded used Nigeria to understudy behaviour original equipment manufacturers (OEMs) regarding toxicity, potentials,...

Abstract This study assessed the progression of Pb, Cd and Cr concentrations in plastic components (PCs) printed wiring boards (PWBs) 59 end-of-life (EoL) mobile phones (MPs) produced between 2000 2015 by two leading original equipment manufacturers (OEMs) patronized Nigerians. was done to behavior OEMs complying with some widely acceptable regulations. Metals PCs PWBs MPs were extracted following EPA 3050B method extracts analyzed using atomic absorption spectrophotometry technique....

Abstract In this study, the silver extraction potential from waste x-ray films using sodium hydroxide and nitric acid was studied. Sodium of different concentrations were used as stripping solutions to determine optimum leaching concentration. Optimum time temperature also investigated by varying temperatures, respectively. The stripped analysed for concentration Flame Atomic Absorption Spectrophotometer. Results obtained revealed that, stripping, 26.6 mg kg −1 ion at an concentration, 1.5...

This study investigated the potential of recycling defatted Carica papaya seeds biosorbent (DPS) waste with adsorbed Pb and Cd in clay bricks. Physico-chemical, microscopic technological properties were performed on raw materials fired probes incorporated 0 wt.% to 15 DPS made by dry compression technique, dried at 700°C, 800°C 900°C. Leaching tests conducted ascertain their environmental safety. Incorporation had remarkable influence materials. Water absorption total linear shrinkage...

Abstract In this study, soil contamination by toxic metals released from cathode ray tubes (CRTs) openly discarded within the vicinities of artisans’ workshops in Nigeria was assessed order to ascertain metal leaching potential CRTs, mobility and bioavailability leached soil. Furthermore, ecological geochemistry impacted soils carried out. Seventy samples were randomly collected thirty five locations at depths 0 - 15 cm (top-soil) 30 (sub-soil), respectively two selected states each...

Energy use in rural areas Nigeria is largely dependent on firewood and other biomass sources. Biomass fuel domestically used daily for cooking lighting. Continuous of this energy resource has negative impact both the environment human health, especially users. Many pulmonary problems have been associated with continuous exposure to smoke arising from burning these materials. The briquetting a more sustainable alternative raw as briquettes burn little or no smoke. However, there scarcity data...