scholarly journals Validasi Metode Analisis Kadar Kalsium pada Susu Segar secara Titrasi Kompleksometri

2018 ◽  
Vol 38 (2) ◽  
pp. 187
Author(s):  
Moh. Taufik ◽  
Seveline Seveline ◽  
Emilia Ratih Saputri
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Ethylenediaminetetraacetic Acid ◽  
Limit Of Detection ◽  
Calcium Content ◽  
Limit Of Quantification ◽  
Complexometric Titration ◽  
Fresh Milk ◽  
Linearity Test

Analysis of calcium content in fresh milk generally uses Atomic Absorption Spectroscopy (AAS). Alternatively, it could be analyzed using complexometric titration. The study aimed to validate the method of calcium content analysis in fresh milk by complexometric titration. The results showed that the linearity test using calcium standard solution at a working range of 4-24 mg/100 mL had R2 of 0.9983, while the limit of detection and limit of quantification were 0.47 mg/100 mL and 1.57 mg/100 mL, respectively. The accuracy by spiking method at the spiking concentration of 60 mg/100 mL sample was 99.29%. The repeatability and intra-lab reproducibility showed acceptable precision with CV value of 0.98% and 2.59%, respectively. The results of ruggedness test showed that this method was rugged to the variation of sample volume and ethylenediaminetetraacetic acid (EDTA) concentration. This study proved that complexometric titration can be used to determine calcium content in fresh milk. ABSTRAKAnalisis kadar kalsium pada susu segar umumnya menggunakan Atomic Absorption Spectroscopy (AAS) yang relatif mahal. Salah satu metode alternatif yang dapat digunakan adalah titrasi kompleksometri. Sampai sekarang, data validasi terhadap metode tersebut pada sampel susu segar belum tersedia. Tujuan penelitian ini adalah memvalidasi metode analisis kadar kalsium pada susu segar secara titrasi kompleksometri. Hasil penelitian menunjukkan uji linearitas dengan menggunakan larutan standar kalsium pada rentang 4-24 mg/100 mL mempunyai nilai R2 sebesar 0,9983, sedangkan nilai batas deteksi dan batas kuantifikasi berturut-turut adalah 0,47 mg/100 mL dan 1,57 mg/100 mL. Nilai akurasi (recovery) sebesar 99,29% pada konsentrasi spiking 60 mg/100 mL sampel. Hasil penelitian atau metode uji yang divalidasi menunjukkan nilai keterulangan dan reprodusibilitas intralab yang baik dengan nilai CV analisis berturut-turut 0,98% dan 2,59%. Hasil uji ketangguhan menunjukkan metode ini bersifat tangguh (rugged) terhadap variasi volume sampel dan konsentrasi asam etilenadiaminatetraasetat (EDTA) yang digunakan. Berdasarkan hasil penelitian tersebut, metode titrasi kompleksometri dapat digunakan untuk menentukan kadar kalsium pada susu segar.  

scholarly journals Sequential Collinear Photofragmentation and Atomic Absorption Spectroscopy for Online Laser Monitoring of Triatomic Metal Species

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 533 ◽  
Author(s):  
Jan Viljanen ◽  
Kim Kalmankoski ◽  
Victor Contreras ◽  
Jaakko K. Sarin ◽  
Tapio Sorvajärvi ◽  
...  
Keyword(s):  
Atomic Absorption ◽  
Gas Phase ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Limit Of Detection ◽  
In Situ Monitoring ◽  
Metal Species ◽  
Chemical Reaction Kinetics

Industrial chemical processes are struggling with adverse effects, such as corrosion and deposition, caused by gaseous alkali and heavy metal species. Mitigation of these problems requires novel monitoring concepts that provide information on gas-phase chemistry. However, selective optical online monitoring of the most problematic diatomic and triatomic species is challenging due to overlapping spectral features. In this work, a selective, all-optical, in situ gas-phase monitoring technique for triatomic molecules containing metallic atoms was developed and demonstrated with detection of PbCl2. Sequential collinear photofragmentation and atomic absorption spectroscopy (CPFAAS) enables determination of the triatomic PbCl2 concentration through detection of released Pb atoms after two consecutive photofragmentation processes. Absorption cross-sections of PbCl2, PbCl, and Pb were determined experimentally in a laboratory-scale reactor to enable calibration-free quantitative determination of the precursor molecule concentration in an arbitrary environment. Limit of detection for PbCl2 in the laboratory reactor was determined to be 0.25 ppm. Furthermore, the method was introduced for in situ monitoring of PbCl2 concentration in a 120 MWth power plant using demolition wood as its main fuel. In addition to industrial applications, the method can provide information on chemical reaction kinetics of the intermediate species that can be utilized in reaction simulations.

scholarly journals X-Ray Fluorescence Determination of Manganese in FD&C Blue No. 1

1998 ◽  
Vol 81 (1) ◽  
pp. 89-92 ◽  
Author(s):  
Nancy M Hepp
Keyword(s):  
Confidence Interval ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Limit Of Detection ◽  
X Ray ◽  
Fluorescence Determination

Abstract An X-ray fluorescence (XRF) method was developed for determining manganese in FD&C Blue No. 1 from simply prepared pressed pellets. Results were compared with those of atomic absorption spectroscopy (AAS) of acid-digested or ashed samples. Levels of manganese determined by XRF and AAS were equivalent. The limit of detection (3σ) for the XRF method was 3µg manganese/g dye. The 95% confidence interval at the specification level was 100 ± 10 μg manganese/g dye

DETERMINATION OF ARSENIC, CADMIUM, LEAD, COOPER AND ZINC IN DRINKING WATER FROM R. MACEDONIA

2018 ◽  
Vol 28 (4) ◽  
pp. 1259-1264
Author(s):  
Kiril Lisichkov ◽  
Katerina Atkovska ◽  
Neven Trajchevski ◽  
Orce Popovski ◽  
Nadica Todorovska
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
Supply System ◽  
Water Supply System ◽  
Bottled Water ◽  
Cadmium Lead ◽  
The City

The presence of some chemical compounds at higher levels than maximum permissible concentrations (MPC) in the drinking water, suggests of water resources pollution. In this paper the following elements were analyzed: total arsenic, cadmium, lead, cooper and zinc. Twelve samples of water from the water supply system from the city of Skopje were examined during one year from three different springs. Also, ten samples of bottled water from three producers from the Macedonian market were tested.The determined average mass concentrations of total As, Cd(II), Pb(II), Cu(II) and Zn(II) in the analyzed water samples from the water supply system are 1.35 μg/l, 0.06 μg/l, 0.6 μg/l, 0.9 μg/l and 1,12 μg/l, respectively, and for the tested bottled water, the mean values ranges from 0.56 - 0.83 μg total As / l, 0.053 - 0.056 μg Cd(II)/l, 0.51 - 0.54 μg Pb(II)/l , 0.6 - 0.87 μg Cu(II)/l and 0.68 - 0.8 μg Zn(II)/l water.The following instrumental analytical methods and techniques were used for the analysis of the tested samples of drinking water: flame atomic absorption spectroscopy (AAS), atomic absorption spectroscopy with hydride cеll, electrothermal atomic absorption spectroscopy.The obtained results are shown in tables and graphic form. According to the obtained results a comparative analysis was carried out indicate that it is a water of good quality that can be used in different branches of the process industry.The obtained results in this paper do not exceed the values of the MPC of the Republic of Macedonia prescribed by the legal regulations for the drinking water, which confirm the health safety of the drinking water from the water supply system in the city of Skopje and the packed waters from the Macedonian market in relation to the tested elements.

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