INTRODUCTIONIn this experiment, we had determined the concentration of chromium (VI) via

absorption spectroscopy to conclude whether the water sample is suitable for drinking or

agricultural process. Spectroscopy is the study about interaction between matter and also

radiated energy as a function of wavelength. In the past decades, spectroscopy is used of

visible light to dispersed according it owns wavelength. Now, the concept had been expanded

to comprise any interaction of radiated energy as function of its wavelength.

Chromium (Cr) is included in heavy metals. It is odourless and tasteless metallic

element. Most common forms of chromium that present in drinking water are Cr (III) and Cr

(VI). It also naturally present in rivers, lakes and streams. Chromium (III) is often added to

vitamins as a diet supplement. It has low toxicity rather than Cr (VI). Cr (VI) is more toxic

and poses potential health risks. People that indigested or inhaled Cr (VI) could experience

allergic dermatitis.

Chromium is also necessary to enhance the actions of insulin and maintaining normal

metabolism for storage of proteins, fats and carbohydrates. Lack intake of chromium will

cause the development of glucose intolerance and leads to type 2 diabetes. It also helps

increase of HDL that is known as good cholesterol to preventing heart disease. However, at

higher dosage, it will leads to efficacy of chromium in glycemic control, concern exist for

potential genotoxic.

Other than that, metallic chromium main uses are in alloys such as stainless steel,

chrome plating and metal ceramics. Chromium is unstable in oxygen, it will produce a thin

oxides layer that will impermeable to oxygen to protect the metal. Chromium (VI) compound

are powerful oxidants at low or neutral pH. It posing high risk to humans and animals due to

its carcinogenic and mutagenic properties.

In terms of environmental effects, chromium enters air, water and soil in the form of

Cr (III) and Cr (VI). Various activities that human had been done that increase the

concentration of chromium such as, chemical, textile and leather manufacturing, electro

painting.

Quantity of Cr (VI) present in polluted water sample will be detect using a

spectrophotometer and a standard solutions. From this we can conclude whether the

sample is suitable for drinking

RESULTS

0.011 0.047 0.116 0.1350

50

100

150

200

250

300

350

Graph of concentration of Chromium (VI) in lake water (ppm) vs absrobance value

concentartion of chromium (IV) in lake water (ppm)

Series2

Series3

Absorbance value

Con

cent

ratio

n of

Chr

omiu

m (V

I) in

la

ke w

ater

(ppm

)

REFERENCES

Docfom, (n.d.), determination of chromium(vi) via absorption of spectroscopy,

retrieved from http://www.docfoc.com/39166236-detedetermination-of-chromium-vi-

concentration-via-absorption-spectroscopy-rmination-of-chromium-vi-concentration-

via-absorption-spectroscopy