TY  - SER
AU  - Ali, S. Azhar
AU  - Khalid, Zahida
AU  - Mahmood, Khalid
TI  - Photometri Determination of Trace Amount of Nitrate and Nitrite with 2-Hydroxybenzoic Acid Ane Method
KW  - Photometry
KW  - Trace Level
KW  - Nitration
ER  -