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Atikah Atikah
Jurusan Kimia Fakultas MIPA Universitas Brawijaya Malang
Environmental Science

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Development of Spectrophotometric Methods for Iodide Determination Using Hydrogen Peroxide (H2O2) as Oxidizing Abner Tonu Lema; Hermin Sulistyarti; Atikah Atikah
Natural B, Journal of Health and Environmental Sciences Vol 2, No 4 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (230.801 KB) | DOI: 10.21776/ub.natural-b.2014.002.04.2

Abstract

Serious disorders of iodine deficiency can cause irreversible cretinism, pregnancy complications, goiter, compromised thyroid hormone production, mental impairment and decreasing cognitive function. In order to detect early indication of Iodine Deficiency Disorders (IDD) a development of simple spectrophotometric method for iodide  determination  is proposed using hydrogen peroxide (H2O2) as an oxidizing agent. Determination of iodide is based on the oxidation reaction of I- to I2 that form blue  complex compound I2-starch. The blue color intensity of the complex I2-starch  produced was measured at wavelength of 611 nm. Several parameters were optimized: complex formation and oxidation time of iodide, the optimum concentration of oxidizing agent, H2SO4, starch and effect of interfering ions (chloride, bromide, thiocyanate), with optimum conditions obtained of respectively: 10 minute, H2O2 0.1 M, H2SO4 0.05 M, starch 0.2 %. Under these condition, the method showed linearity of 5 - 60 ppm, limit of detection and quantification of 0.62 and 2.09 mg/L, respectively. This method has been successfully applied to synthetic and urine samples and can be recommended for the detection of iodide in patients hyperthyroidism and KI tablets.
Aquatic Sediments Roles of Brantas Watershed Outlet on Availability of Ca2 +, Mg2 +, Na +, K + and Boron in Water Board as Irrigation Water Source I Made Gede Sudyadnyana Sandhika; Barlah Rumhayati; Atikah Atikah
Natural B, Journal of Health and Environmental Sciences Vol 3, No 1 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (384.547 KB) | DOI: 10.21776/ub.natural-b.2015.003.01.1

Abstract

The role of aquatic sediment of outlet DAS Sumber Brantas for the availability of Ca2+, Mg2+, Na+, K+, and boron in water body has been investigated from July-September 2014. Sediment and water samples were collected from the outlet of Sumber Brantas watershed in Arboretum Sumber Brantas village, Batu. This research aim was to investigate the distribution and sediment role for availability of Ca, Mg, Na, K, and boron in water body. The research results show that Ca was the dominant metal ion that was found in water body, while in sediment metal ions that dominant were Ca and Mg. The concentration of metal ion Ca was highest in August with average of concentration 1105.51 ppm and concentration of metal ion Mg was highest in July with average of concentration 1038.94 ppm. Comparison for metal ions concentration in water and sediment shows that sediment had a greater role as a sink for metal ion Ca and boron, while the sediment was a source for metal ions Mg, Na, and K in water body. 
Co-Authors Abner Tonu Lema Barlah Rumhayati Hermin Sulistyarti I Made Gde Sudyadnyana Sandhika