A new method for radionuclide sample analysis of surface water has been demonstrated at the Savannah River Site, a U.S. Department of Energy manufacturing facility, currently in standby. The method makes use of selective solid phase extraction (SPE) disks being placed in a modified portable aqueous sampler. The analytes currently measured by this in-situ preparation are Tc, Sr, Cs and Co. The S...

In mangrove ecosystems, strong reciprocal interactions exist between plant and substrate. Under semi-arid climate, Rhizophora spp. are usually predominant, colonizing the seashore, and Avicennia marina develops at the edge of salt-flats, which is the highest zone in the intertidal range. Along this zonation, distribution and speciation of C, Fe, S, N, and P in sediments and pore-waters were inv...

INTRODUCTION People rely on the quality of the bottled drinking water, expecting it to be free of microbial contamination and health hazards. OBJECTIVES To evaluate the quality of bottled drinking water sold in Jaffna peninsula by analysing the physical, chemical and microbial contents and comparing with the recommended Sri Lankan Standard (SLS) values. METHODS All bottled water samples sol...

A new sampling device was used to obtain 8 detailed profiles of groundwater and associated sediment properties to ∼30 m depth in a 4 km area of Bangladesh that is characterized by high spatial variability in groundwater As. Concentrations of dissolved As, Fe, andMn ranged from b0.1 to 600 μg/L, b0.1 to 18 mg/L, and b0.1 to 4 mg/L, respectively. Voltammetric measurements conducted in the field i...

This document describes best practices for analysis of dissolved organic matter (dissolved carbon and total nitrogen) in seawater samples. Included are SOPs sample collection storage, details laboratory using high temperature combustion on Shimadzu TOC analyzers, suggestions quality control assurance. Although written specifically GO-SHIP oceanographic community practices, many aspects processi...

The Colorado River is a principal source of water for 40 million people and farmlands in seven states the western US Republic Mexico. river has been under intense pressure from effects climate change anthropogenic activities associated with population growth leading to elevated total dissolved solid (TDS) suspended (TSS) concentrations. Elevated TDS- TSS-related issues basin have direct negativ...

A novel on-line oxidation method of ultra-trace Cr(III) dissolved in natural water has been developed using a flow electrolysis cell. This method was successfully applied to the determination of the total Cr concentration by flow injection-solid phase spectrophotometry using diphenylcarbazide as a coloring agent. With the applied potential of 1.35 V (vs. Ag/AgCl) and the flow rate of 0.80 cm(3)...

Pada penelitian ini telah dirancang dan dibuat sistem penyiraman tanaman hidroponik secara otomatis menggunakan sensor total dissolved solid (TDS) berbasis mikrokontroller ATmega328. Mikrokontroler yang terdapat dalam modul Arduino Uno berfungsi sebagai pengatur jalannya rancangan. Penelitian bertujuan untuk membantu pemberian nutrisi sehingga dapat meringankan pekerjaan manusia. Hasil kalibras...

INTRODUCTION Mosquito larval ecology is important in determining larval densities and species assemblage. This in turn influences malaria transmission in an area. Therefore, understanding larval habitat ecology is important in designing malaria control programs. METHOD Larval surveys were conducted in 20 localities under five sentinel sites (Padavisiripura, Gomarankadawala, Thoppur, Mollipoth...