In the present study, different qualitative tests used for detection of adulterants in milk were evaluated for (1)
sensitivity (LoD), and (2) interference of common preservatives in the detection of adulterants in milk. Sulphate can be
detected in milk, using barium chloride test and for checking the sensitivity of test samples of milk were prepared by
addition of sodium sulphate at the rate of 0.00, 0.01, 0.025, 0.05, 0.10, 0.15 and 0.20 (g per 100 ml milk). For each
adulterant and each qualitative test, five replications were conducted. For detection of sulphate in milk, only barium
chloride test is reported. No variation was reported in literature for barium chloride test. The presence of hydrogen
peroxide or formaldehyde had no effect on this test, but sodium hydroxide had a negative effect on the test.