Main Article Content
Abstract
The presence of heavy metals in the environment can be a serious problem because it is harmful to human health. One of the heavy metal ions that pollute the environment is the Cr6+ metal ion. The usual tool used to analyze metal ions is Cr6+ is the Atomic Absorption Spectrometry (AAS) and Inductively Couple Plasma (ICP) which are very expensive and require trained personnel. The purpose of this study was to design a simple detector for Cr6+ metal ions as an alternative to conventional methods using AAS and ICP. The detection tool was developed using the android-based digital image method with SLR data analysis techniques obtained from the reaction of the metal ion complex Cr6 + with the compound dhypenilcarbazida (DPC). The parameters of the tool measured were accuracy, selectivity and sensitivity with the reaction of DPC compounds as complexes. The comparison level of this method is the complex method with DPC using a UV-Vis spectrophotometer. This research was carried out in the Chemistry Laboratory FKIP UNIB in November 2018 until March 2019. The implementation of tool parameters was tested to samples of aquatic environments in Bengkulu City, namely PDAM Kota Bengkulu water, tap water of FKIP UNIB Dean, Lake UNIB water, Sungai Hitam water and water Pantai Panjang. The results showed that the detection of Cr6+ metal ions made by the android-based digital image method had better accuracy, selectivity and sensitivity than conventional methods. The DPC is selective for Cr6 + metal ions with a change in color from clear to violet, at a wavelength of 540 nm. Accuracy was checked using a UV-Vis spectrophotometer with 99% accurate results. After that, test sensitivity to Cr6 + metal ions. using the android application method generates a Limit of Detection (LOD) of 6.7 ppb. The detector that was developed was applied to water samples in the city of Bengkulu, it turned out that all of the water samples showed that the levels of Cr6+ metal ions were still below the threshold determined by the Minister of Health Regulation, so it was still safe to use in everyday life.
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References
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References
Ashley, K., Howe, A. M., & Nygren, O. 2003. Sampling And Analysis Considerations For The Determination Of Hexavalent Chromium In Workplace Air, 707–716. https://doi.org/10.1039/B306105c
Day, R.A Dan L.A. Underwood. 2002 . Analisis Kimia Kuantitatif, Terjemahan: Iis Sopyan, Edisi Keenam. Jakarta: Erlangga. Isbn 979-688-241-8
Hayes, W. A. Dan Kruger. C. L. 2014. Hayes Priciple And Methods Of Toxicology Sictd Edition. New York: Taylor & Francis Grup
Peraturan Menteri Kesehatan Ri. 2010. Persyaratan Kualitas Air Minum. Jakarta: Permenkes Ri No. 492/Menkes/Per/Iv/2010
Rahmayun, I. (2014). Enkripsi Sms ( Short Message Service ) Pada Telepon Selular Berbasis Android Dengan Metode Rc6. Jurnal Momentum. ISSN : 1693-752x, 16(1), 63–73.
Roda, A., Michelini, E., Zangheri, M., Di, M., Calabria, D., & Simoni, P. (2016). Trends in Analytical Chemistry Smartphone-based biosensors : A critical review and perspectives. Trends in Analytical Chemistry, 79, 317–325. https://doi.org/10.1016/j.trac.2015.10.019
Saputra, A., Prasetio, A. B., Radiarta, I. N. 2010. Distribusi Logam Berat Dalam Air Dan Sendimen Di Perairan Danau Maninjau, Provinsi Sumatra Barat. Prosiding Forum Inovasi Teknologi Akuakultur 2010. Pusat Riset Perikanan Budidaya.Http://Repository.Ipb.Ac.Id
Sereshti, Hassan, Mina Vashegani Farahani, Majid Baghhdadi. 2015. Trace Determination Of Chromium(VI) In Environmental Water Samples Using Innovative Thermally Reduced Graphen (TRG) Modified Sio2 Adsorbent For Solid Phase Extraction And UV-Vis Spectrophotometry.Talanta. 1(1). 1-30.
Sun, H. W., Kang, W. J., Liang, S. X. Jing, H., Dan Shen, S.G. 2003. Determination Of Chromium (Iii) And Total Chromium In Water By Derivattve Atomic Ansorpstion Spectrometry Using Flow Injection On-Line Proconcentration With A Double Microcolumn. Analytical Sciences, Vol. 19: 589-592.
Supriyadi E., S. Mariani, Sugiman. 2017. Perbandingan Metode Partial Least Square (PLS) dan Principal Component Regression (PCR) Untuk Mengatasi Multikolineritas
Tyas, N.M., Affandi, R. 2016. Uji Toksisitas Letal Cr6+ Terhadap Ikan Nila (Oreochromis Ni-Loticus). Jurnal Ilmu Pertanian Indonesia (Jipi);21(2);128-132
Wei, Q., Nagi, R., Sadeghi, K., Feng, S., Yan, E., Ki, S. J., & Caire, R. (2014). Terms of Use Detection and Spatial Mapping of Mercury Contamination in Water Samples Using a Smart-Phone, (2), 1121–1129