Penentuan Kadar Tembaga (Cu) dalam Sampel Batuan Mineral

Pambudi, M. Anugrah Rizky; Suprapto, Suprapto

doi:10.12962/j23373520.v7i2.30088

Cited by 5 publications

(4 citation statements)

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“…Pemanasan dilakukan selama 30-45 menit pada suhu 80-100ºC dikarenakan HNO3 memiliki titik didih 121 ºC dan H2O2 memiliki titik didih 107 ºC. Pemanasan harus dilakukan di bawah titik didih pelarut, agar pelarut tidak menguap sebelum proses destruksi selesai [19]. Pemanasan bertujuan untuk mempercepat reaksi, sehingga proses destruksi menjadi lebih singkat.…”

Section: Preparasi Sampelunclassified

Uji Kualitatif dan Penetapan Kadar dengan Metode Spiking pada Logam Pb di Dalam Minuman Kopi Kaleng

Patriani,

Nugraha,

Kurniawan

2023

JSSCR

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Lead (Pb) is a heavy metal that is naturally present in the earth’s crust. This metal is dispersed in nature in small amounts through natural processes. Lead that accumulates in the environment is not biodegradable and its toxicity does not change. Contamination of lead (Pb) meta; in canned drinks can occur due to imperfect packaging, damage or rust. Lead metal is obtained from soldering tools. This study aims to identify the presence of Pb metal in canned coffee drinks. In addition, to find out the method of preparation that was carried out correctly the spiking method was used. Samples were taken in Pontianak City with purposive sampling technique. The sample of this research is canned coffee drinks with 3 different brands (brands A, B and C) circulating in the city of Pontianak. The qualitative test was carried out using 0.5 N KI reagent and 2 M HCl which was dropped into the sample. A positive result on a sample that was dripped with 0.5 N KI reagent was a yellow precipitate, while a positive result on a sample that was dripped with 2 M HCl reagent was a white precipitate. The spiking method was carried out by adding 0.3 mL of 1000 ppm Pb standard solution and adding the sample to a volume of 2 mL. Then, wet digestion was carried out using 10 mL HNO3 and 2 mL H2O2 as solvent. The results of the qualitative test showed that all samples with 0.5 N KI reagent were clear and black precipitate formed. All samples that were dropped with 2 M HCl reagent were clear and no precipitate was formed. In assay by spiking method, the levels obtained are 73.54 mg/kg and % recovery is 86.667%. All tested samples did not contain Pb metal and the preparation method used was correct.

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Section: Preparasi Sampelunclassified

Uji Kualitatif dan Penetapan Kadar dengan Metode Spiking pada Logam Pb di Dalam Minuman Kopi Kaleng

Patriani,

Nugraha,

Kurniawan

2023

JSSCR

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“…Larutan selanjutnya dipanaskan secara terbuka di atas hotplate pada suhu 100oC-121oC sampai larutan terlihat bening, dengan catatan tidak sampai kering. Adanya pemanasan pada proses destruksi membantu mempercepat pemutusan ikatan organologam menjadi anorganik (Wulandari, E.A., 2013). Titik didih dari HNO3 sebesar 121oC, sehingga penggunaan suhu 100oC dapat mencegah larutan HNO3 cepat habis sebelum destruksi selesai.…”

Section: Pembahasanunclassified

Hubungan Toksisitas Timbal (Pb) dalam Darah dengan Hemoglobin (Hb) pada Mekanik Bengkel Motor di Purwokerto

Zuhri,

Dhanti

2023

SLJIL

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The development of transportation technology has resulted an increase of public need for economic activities in the form of vehicles. This condition causes an increase in the number of workshops to repair and maintain vehicles. Workshop activities result in waste containing lead (Pb) such as used lubricating oil (oil), gasoline, and used batteries. Lead is a heavy metal that is classified as a Hazardous and Toxic Material (B3). It can be toxic to the human body when it binds to erythrocytes, it will also inhibit heme synthesis which results in decreased production of hemoglobin (Hb). The objective of this study was to determine the correlation between blood lead (Pb) levels and hemoglobin in motorcycle workshop mechanics in Purwokerto. The type of this research is analytic observational using a case control study research design with a sample of 15 respondents obtained using purposive sampling method. The examination of metals in the blood using the Atomic Absorption Spectrophotometer (AAS), while hemoglobin using a Hematology Analyzer (HA). The results of the study indicated that low lead levels were 0 g/dl and the high lead levels were 7.7 g/dl., while low hemoglobin levels were 12.7 g/dl and high lead levels were 16.2 g/dl. The results of the analysis using the correlation spearmen test obtained a significant value (p) = 0.833 and a correlation value (r) = 0.060. The conclusion is that Ho is accepted, so there is no correlation between blood lead levels and hemoglobin levels in motorcycle workshop mechanics in Purwokerto

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“…Surface roughness can induce a greater contact angle on a hydrophobic surface, indicative of the increase in repellence towards the water. Conversely, the rougher a surface is on a hydrophilic surface, the lower the contact angle will be, meaning that larger interaction with water is taking place [72].…”

Section: Hydrophobicitymentioning

confidence: 99%

Superhydrophobic coating based on silica derived from bagasse modified with vinyltriethoxysilane and copper (Cu) as antibacterial agent

Silviana

Sa’adah

Saputra

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Prevention of material degradation can be achieved through the coating. Surface coating is an economically advantageous method in producing desired characteristics and auxiliary aesthetics of surface material. Modern coating processes usually use nanomaterial technology made from silica. Silica can be taken from various sources, such as bagasse waste. Bagasse has high silica content up to 88%. Coating material from silica has good adhesion, good protective properties that allow it to withstand the diffusion of water vapor, ions, and oxygen to metal surfaces. Modified silica can be used to produce superhydrophobic surfaces. The addition of vinyl groups to silica can improve the elastic and mechanical properties without much variation in density or thermal conductivity. The addition of vinyltriethoxysilane can create uniform distribution of nanoparticles. Modification of silica can be done to procure anti-bacterial properties. Copper (Cu) is often used as a high activity anti-bacterial with a fairly affordable cost. With the supplementary anti-bacterial properties, material damages attributed to bacteria may be prevented or reduced. This review aims to provide an overview of the production of superhydrophobic coatings using different methods, analyze the characteristics of synthesized materials, and choose suitable methods for producing superhydrophobic coatings. This review proposes the fabrication of silica superhydrophobic coating with the sol-gel method modified through the addition of vinyl and Cu as an anti-bacterial. This recommendation is based on the literature study that has been carried out.

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Penentuan Kadar Tembaga (Cu) dalam Sampel Batuan Mineral

Cited by 5 publications

References 0 publications

Uji Kualitatif dan Penetapan Kadar dengan Metode Spiking pada Logam Pb di Dalam Minuman Kopi Kaleng

Uji Kualitatif dan Penetapan Kadar dengan Metode Spiking pada Logam Pb di Dalam Minuman Kopi Kaleng

Hubungan Toksisitas Timbal (Pb) dalam Darah dengan Hemoglobin (Hb) pada Mekanik Bengkel Motor di Purwokerto

Superhydrophobic coating based on silica derived from bagasse modified with vinyltriethoxysilane and copper (Cu) as antibacterial agent

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