How to check water adulteration in Milk by using lactometer :
Water Adulteration Test in Milk without Lactometer :
- 1) Slip Test : To identify adulteration from water, a simple test is milk slip test. Run the drop of milk on smooth or polished surface. Pure milk leaves some residue or traces behind. However, milk mixed with water will simply flow out.
- 2) Reduction Test : Boil milk on slow heat for 2-3 hours till it solidifies and become hard (khoya). Rock solid, rough residue means the milk is adulterated while oily residue means its of good quality.
- 3) Checking for Synthetic Milk : Synthetic milk is made by mixing chemicals and things like soap in natural milk. Synthetic milk can be easily identified by bad taste. It feels soapy when rubbed and turns yellowish when heated.
- 1) Salt and detergents are added to adjust lactometer reading to add thickness to the milk.
- 2) Contaminate milk can be countered by ensuring proper sanitation and hygiene at all processing stages as well as by boiling and pasteurizing milk properly.
- 3) Nitrogenous compounds are added to artificially enhance the taste of protein in milk.
- 4) Synthetic milk turns yellowish on heating. With some experience, one can easily make out whether it is pure natural milk or a synthetic liquid sold as milk.
- 5) One of the most common form of adulteration in milk is mixing of urea as it does not changes the taste and is little difficult to detect.
- 1) Make sure you boil the milk on slow flame till boiling point. Avoid re-boiling milk as it brings down the nutritional value of milk.
- 2) While the easiest way to adulterate milk is by adding water, reagents and prohibited neutralisers like hydrated lime, sodium hydroxide, sodium carbonate or sodium bicarbonate are added to milk to prevent spoilage.
- 3) One really can not do anything when it comes to the packed pasteurized milk. Such products undergo a series of processes and it is hard to trace the point of adulteration.
- 4) Since the adulteration techniques have advanced these days so it is very difficult to identify adulteration. You can not find any adulteration until you use some catalyst to check its purity.
- 5) There were 37 pure Indian breeds and due to foreign activist’s effort almost all the breeds are now extinguished with only few breeds left.
- 6) Mixing water in milk is a common practice by local milkman. Having harmful elements like Urea, Carbonates and Bicarbonates, salt, sugar, Hydrogen Peroxide, Neutralizers (NaHCO3, Na2 CO3, NaOH, Ca(OH)2 etc.), sodium chloride, etc. added to our everyday drink is completely unacceptable.