بررسی میزان نیتریت و نیترات در شبکۀ توزیع آب آشامیدنی شهر همدان در سال 1377

Nitrate&nbsp; and&nbsp; nitrite&nbsp; in&nbsp; drinking&nbsp; water&nbsp; is&nbsp; harmful&nbsp; for&nbsp;&nbsp; human health, &nbsp;&nbsp; specialy when its amount is more than the standard&nbsp; level.The purpose of &nbsp;&nbsp; this&nbsp;&nbsp; study&nbsp;&nbsp; include&nbsp; measuring&nbsp; concentration&nbsp;&nbsp; of&nbsp;&nbsp; nitrate&nbsp; and&nbsp; nitrite&nbsp; in &nbsp;&nbsp; drinking water of&nbsp; Hamadan city in each&nbsp; season, during one year. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; In order to compare the seasonal nitrate and nitrite,totally 232 sample &nbsp;&nbsp; were taken from water. The&nbsp; WHO standard methods was used to analysis &nbsp;&nbsp; the&nbsp;&nbsp; nitrate and nitrite concentration in the water . &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The results&nbsp; showed that concentration of nitrate and nitrite were 17.72 &nbsp;&nbsp; and&nbsp; 0.03 mg/lit respectively, that were not more than&nbsp; standard limit.&nbsp; But &nbsp;&nbsp; the&nbsp; concentration&nbsp; of&nbsp;&nbsp; nitrate&nbsp; in&nbsp; summer was more than&nbsp; others seasons, &nbsp;&nbsp; and&nbsp; the difference was statistically significant (P < 0.05 ) . &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Finally, at the present time,&nbsp; it&nbsp; can&nbsp; be&nbsp; concluded that, concern&nbsp; with &nbsp;&nbsp; concentration&nbsp; of&nbsp; nitrate&nbsp; and&nbsp; nitrites&nbsp; in&nbsp; drinking&nbsp; water&nbsp; of&nbsp; Hamadan, is &nbsp;&nbsp; healthy.