scholarly journals Analysis of methylmercury and total mercury in seafood using flow injection cold vapour atomic absorption spectrometry

2019 ◽  
Vol 2 (1) ◽  
pp. 40-46
Author(s):  
Nguyen Van Dong ◽  
Le Thi Huynh Mai ◽  
Huynh Vinh Duc ◽  
Ho Thi Hong Diem ◽  
Nguyen Thanh Phuong
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Aqueous Phase ◽  
Flow Injection ◽  
Total Mercury ◽  
Sodium Tetrahydroborate ◽  
Absorption Spectrometry ◽  
Mercury Analysis ◽  
Cold Vapour ◽  
Total Hg

Methylmercury and total mercury in sea food were analysed by flow injection cold vapour atomic absorption spectrometry using sodium tetrahydroborate as a reductant. Methylmercury in aquatic species was leached with HBr 47% as neutral MeHgBr complex and quantitatively extracted into toluene. MeHgBr in toluene was back extracted with L-cysteine into aqueous phase in form of negatively charged MeHg-L-cysteine complex. All organic compounds in the aqueous phase were decomposed with KMnO4/H2SO4 to convert methyl mercury to Hg2+ for direct cold vapour reaction. The seafood sample was digested with aquaregia for total mercury analysis. The limits of detection/quantitation for methylmercury and total mercury were là 0.69/1.3 ng/g and 0.70/2.2 ng/g (as Hg), respectively. The recovery of the analytical methods for MeHg and total Hg were 96.5–105% and 93–101% within the concentration ranges of 2–700 ng/g Hg. The concentrations of MeHg and total Hg in some common seafood such as fish, shrimp and squid were in ranges of 1.2–483.5 ng/g and 4.0 ÷ 663.4 ng/g.

scholarly journals Automated continuous monitoring of inorganic and total mercury in wastewater and other waters by flow-injection analysis and cold-vapour atomic absorption spectrometry

1988 ◽  
Vol 10 (3) ◽  
pp. 140-143 ◽  
Author(s):  
S. E. Birnie
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Continuous Monitoring ◽  
Total Mercury ◽  
Sampling Rate ◽  
Absorption Spectrometry ◽  
Cold Vapour ◽  
Flowing Stream

An automated continuous monitoring system for the determination of inorganic and total mercury by flow-injection analysis followed by cold-vapour atomic absorption spectrometry is described. The method uses a typical flow-injection manifold where digestion and reduction of the injected sample takes place. Mercury is removed by aeration from the flowing stream in a specially designed air-liquid separator and swept into a silica cell for absorption measurement at a wavelength of 253.7 nm. A calibration curve up to 10 µg Hg ml-1using three different path length cells is obtained with a detection limit of 0.02 µg Hg ml-1. The sampling rate of an injection every 3 min produces 20 results per hour from a flowing stream.

Method validation for the determination of total mercury in fish muscle by cold vapour atomic absorption spectrometry

2012 ◽  
Vol 29 (4) ◽  
pp. 617-624 ◽  
Author(s):  
A.P. Nascimento Neto ◽  
L.C.S. Magalhães Costa ◽  
A.N.S. Kikuchi ◽  
D.M.S. Furtado ◽  
M.Q. Araujo ◽  
...  
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Method Validation ◽  
Total Mercury ◽  
Absorption Spectrometry ◽  
Fish Muscle ◽  
Mercury In Fish ◽  
Cold Vapour

scholarly journals Validation of Total Mercury in Marine Sediment and Biological Samples, Using Cold Vapour Atomic Absorption Spectrometry

2018 ◽  
Vol 1 (3) ◽  
pp. 31 ◽  
Author(s):  
Ahmed Elezz ◽  
Hassan Mustafa Hassan ◽  
Hamood Abdulla Alsaadi ◽  
Ahmed Easa ◽  
Saeed Al-Meer ◽  
...  
Keyword(s):  
Trace Elements ◽  
Reference Material ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Marine Sediment ◽  
Environmental Samples ◽  
Total Mercury ◽  
Absorption Spectrometry ◽  
Freeze Dried ◽  
Cold Vapour

A method for the measurement of total mercury (T-Hg) in environmental samples using cold vapour atomic absorption spectrometry (CV AAS) has been validated yielding a dynamic range (0.04–10.00 μg/kg) and high certified reference material (CRM) recovery (>90%). The validation was carried out according to International Union of Pure and Applied Chemistry (IUPAC) validation and Eurachem Guides. A freeze-dried and homogenised sample was weighed and then digested using Suprapur acids (HNO3, H2SO4, and HF) with potassium dichromate solution in a hot block digestion system. A calibration curve was constructed (R2 > 0.999). Two CRMs (Marine Sediment Reference Material (PACS-3) and Trace Elements in Muscle Tissue (Trace Elements and Methylmercury in Mussel Tissue (NIST2976)) were utilised for quality assurance and control. The limit of quantification (LOQ) calculated as 0.04 µg/kg, and uncertainty (U) calculated as 2%. The obtained results showed the suitability of this method for direct mercury measurement in environmental samples. Additionally, the proficiency of this method was recognised by accreditation under the standard of International Organization for Standardization (ISO/IEC 17025:2017) for competence of testing and calibration laboratories.

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