중금속실험

소개

폐기물실험-중금속실험

목차

I. Introduction
A. Principle
B. Theory
C. Equations
II. Materials and Methods
III. Results and Discussion
IV. Conclusions
V. Reference

본문내용

Introduction
Atomic absorption spectroscopy (AAS) determines the presence of metals in liquid samples. Metals include Fe, Cu, Al, Pb, Ca, Zn, Cd and many more. It also measures the concentrations of metals in the samples. Typical concentrations range in the low mg/L range.
The heavy metal lead the atomic-absorption(AA), atomic absorption spectroscopy(AAS) and Inductively Coupled Plasma Emission Spectroscopy(ICP) about under using will measure an absorbance.
A. Principle
AAS It is fundamental principle of the selective absorption which happens when passing the atom fume, from a light source radiation a radiant ray. As fixed quantity method of the many metal element the selectivity is the superior and from ppm until ppb it has a high sensitivity.
hich measures the extinction of the leaden complex salt from 520nm. Fixed quantity scope 0.001 ~ 0.04mg and the standard deviation ratio is 3 ~ 10%.
Pretreatment of sample : Extractable metals are lightly adsorbed on particulate material. Because avoidable us rigidly controlled conditions to obtain meaningful and reproducible results. To reduce the interference by organic matter and to convert metals associated with particulates to a form (usually



Materials and Methods
Pretreatment of sample
At collection, acidify entire samples with 5mL conc /L sample. To prepare sample, mix well, transfer 100mL to a beaker or flask and add 5mL 1+1 high purity HCl. Heat 15 minutes on a steam bath. Filter through a membrane filter and carefully transfer filtrate to a tared volumetric flask. Adjust volume to 100mL with metal-free water, mix and analyze.
AAS
Filtration sample solution(as the lead containing below 0.04mg) it takes in the minute misfortune funnel citric acid two ammonium(10W/V%) 5ml and hydrochloric acid amin (10W/V%) 1m it will shake and it will mix and short time about under politics the ammonia water(1+1) after put in and with the alkalinity(pH about 8.5~10) potassium cyanide (5W/V%) 5ml put in and it will ask and with about 100ml to put in it does.
dithizone tetrachloride carbon(0.005W/V%) 5ml puts in and 1minutes it shakes strong and it mixes and about under politics carbon tetrachloride layer about under crisis it moves the dithizone tetrachloride carbon

참고자료

· http://environmentalchemistry.com/yogi/periodic/Pb.html
· Waste processing introduction (p76) science Hwang Jae seok Donghwa technology 2001.08.10