A study of water quality parameters (temperature, conductivity, total dissolved solid, dissolved oxygen, pH and water hardness) in Titiwangsa Lake was conducted in January, April, July and October 2010. The water quality parameters were tested and recorded at different sampling stations chosen randomly using hydrolab data sonde 4 and surveyor 4 a water quality multi probe (USA). Six metals i.e., cadmium, chromium, lead, nickel, zinc and copper were determined in five different compartments of the lake namely water, total suspended solids, plankton, sediment and fish. The metals concentration were determined by Inductively Coupled Plasma Mass Spectrometer (ICP-MS), perkin elmer elan, model 9000. The water quality parameters were compared with National Water Quality Standard (NWQS Malaysia) while metal concentrations were compared with Malaysian and international standards. The study shows that water quality parameters are of class 2. This condition is suitable for recreational activities where body contact is allowed and suitable for sensitive fishing activities. Furthermore, metal concentrations were found to be lower than the international standards, therefore toxic effects for these metals would be rarely observed and the adverse effects to aquatic organisms would not frequently occur.

A study of water quality parameters in Cempaka Lake was conducted in January, April, July, and October 2010. The water quality parameters such as temperature, conductivity, total dissolved solid, dissolved oxygen, pH, and water hardness were determined. Six metals i.e. cadmium, chromium, lead, nickel, zinc, and copper were also determined. The water samples were collected randomly from different sampling points around the lake. The water quality parameters were compared with National Water Quality Standard (NWQS Malaysia) whereas metal concentrations were compared with international standards. Study showed that the water temperature and conductivity values increased during the months of the study with the averages of 27.6ºC and 1709µS/cm respectively. The dissolved oxygen and pH values were within the normal ranges with the averages of 1.00 mg/l and 7.37 respectively while the total dissolved solid values increased during the study period with the average of 896 mg/ l. Furthermore, hardness values indicated that the water of the lake classified as soft water with the average of 34.3CaCo 3 mg/l. For water quality parameters, study showed that all parameters were in natural concentration range (class I) according to National Water Quality Standard (NWQS Malaysia) except for conductivity, total dissolved solid and dissolved oxygen values. Results showed that the mean metal concentrations (in micrograms per liter) in Cempaka Lake water based on monthly sampling (in descending order) for Zn, Cu, Ni, Cr, Pb, and Cd were 11.08, 3.41, 2.80, 2.43, 0.49 and 0.24 µg/L respectively. Results showed that metals concentrations were lower than maximum concentrations allowed by Malaysian and international standards in protecting aquatic life.

A study of water quality parameters (temperature, conductivity, total dissolved solid, dissolved oxygen, pH and water hardness) in Ampang Hilir Lake was conducted in January, April, July and October 2010. The water quality parameters were tested and recorded at different sampling stations chosen randomly using Hydrolab Data Sonde 4 and Surveyor 4 a water quality multi probe (USA). Six metals which were cadmium, chromium, lead, nickel, zinc and copper were determined in five different compartments of the lake namely water, total suspended solids, plankton, sediment and fish. The metals concentration were determined by Inductively Coupled Plasma Mass Spectrometer (ICP-MS), Perkin Elmer Elan, model 9000.The water quality parameters were compared with National Water Quality Standard (NWQS Malaysia) while metal concentrations were compared with Malaysian and international standards. The study shows that water quality parameters are of class 2. This condition is suitable for recreational activities where body contact is allowed and suitable for sensitive fishing activities. Furthermore, metal concentrations were found to be lower than the international standards, therefore toxic effects for these metals would be rarely observed and the adverse effects to aquatic organisms would not frequently occur.

The article discusses the levels of radon concentration in soil samples from the Midelt region of Morocco. Radon is a naturally occurring radioactive gas that is known to increase the risk of lung cancer, and understanding its presence and migration is important for predicting and mitigating radon exposure in indoor environments. The study aims to determine the natural levels of radon radioactivity in soil samples from four locations in the Midelt region and evaluate the collective impact of radiological hazard indices, such as annual effective dose equivalent, surface area, and mass radon exhalation rate. The soil samples were collected from Tounfite, Boumia, Aghbalou, and Zaida, and analyzed using the AlphaGUARD device to measure the activity concentration of radon. This study provides important information about the levels of radon concentration in the soil of the Midelt region of Morocco, which can be used to predict and mitigate radon exposure in residential and other indoor environments.