Isoform Analytical Atomic Fluorescence AFS9300NS Speciation Analyzer for arsenic mercury selenium

Atomic Fluorescence Spectrometry Speciation Analyzer

Model: ASF9300NS

(Isoform Analytical Atomic Fluorescence)

In nature, elements can exist in many different forms of compounds, and the toxicity of these compounds is closely related to their speciation of the existence.  

As for the arsenic compounds, the toxicity of inorganic arsenic much higher than the organic one - - and the more organic perssad combined with, the less the toxicity of arsenic is; for mercury compounds, the toxicity of organic mercury is far bigger than inorganic one, and the toxicity of alkyl mercury is greater than that of aryl mercury.  

Therefore, in the determination of arsenic, mercury and other elements to evaluate its toxicity, speciation analysis is more scientific and accurate than the determination of total amount.  

1. Existing forms of arsenic 

Main arsenic compounds found in the air, soil, water and sediments are As2O3 or arsenite (As3 + ), arsenate (As5 + ), monomethylarsonic acid (MMA) and two methyl arsenate (DMA); in seafood, they are in the forms of arsenobetaine (AsB) and arsenocholine (AsC).

In addition, there are other more complex arsenic compounds, such as arsenic sugar (AsS), arsenolipid compounds (AsL) in seaweed.  

2. The Existing Speciation of Mercury 

Common speciation of mercury in the environment include metallic mercury, inorganic mercury (monovalent and two valence compounds), methylmercury, ethyl mercury, and phenyl mercury, etc.  

Mercury and its compounds are easily dissolved in fatty substances, and are concentrated and enriched gradually through food chains (especially the aquatic food chains), which results in the mercury content in aquatic organisms higher than that in environmental waters.  

When methylmercury enters the human body, 70% of it can be absorbed by the body, mainly concentrated in the central nervous system of the body, kidneys and liver, while a large amount of methylmercury is found in brain tissue.

3. Application fields for the ASF Speciation Analysis:  

Food hygiene inspection 

Environmental samples inspection

City water supply & drainage detection

Agricultural products detection 

Fishery and seawater samples inspection 

Geological and metallurgical examination 

Cosmetics testing 

Drug testing 

Soil, feed & fertilizer testing 

Clinical medical examination 

Main features:  

* Automatic setting lamp current 

* Automatic identification element lamp 

* Visual response system 

* Gas pressure protection  

* Simultaneous determination of elements via two channels

Major Technology 

* For AFS9300, the optical components and atomization device are installed on the same optical platform. With a strict machining tolerance, the optical focus is better coincident with the central axis of the atomization device.  

* Dynamic following denoising technology

Atomic fluorescence uses a colorless astigmatic system. There is no beam splitting system in the instrument, lacking the ability of disassembling the compound light into the monochromatic one; the photomultiplier tube produces a response to all spectrum signals received, to output the combined signal of background and sample.

The dynamic following denoising technology can extract he background signal from the mixed signal and leave the sample signal alone,

which basically eliminates the influence of the background signal on the test signal.

In the process of testing, the photomultiplier tube will not cause the fluctuation of the output signal even if there are other direct light sources.  

* Separated hydride reaction system

The reaction of the hydride and the carrier gas are led to separated reaction system,

which effectively reduces the response pulse.

The flow rate of the reaction solution in the module is reduced so the reaction time is increased, and the reaction efficiency is improved.

High efficiency, low residence: 3 - stage gas - liquid separation system,

Cyclonic centrifugal dehydration gas - liquid separator, enhancing the gas - liquid separation effect.  

* Real Area Integral

The peak area of the area integral is those covered by both the sample peak and the surrounding area of the decision base;

Effectively eliminate current carrying pollution and the interference of memory effect to the test;

The calculation results of the area integration at baseline are close to zero;

Determination of area integral method.

P. S. The semi lethal dose of different arsenic species（mg/kg）

 Notes: detailed configuration list available upon request.