𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Simultaneous spectrophotometric determination of nitrite and nitrate in a flow-injection system

✍ Scribed by Anatol Kojło; Ewa Gorodkiewicz

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
353 KB
Volume
302
Category
Article
ISSN
0003-2670

No coin nor oath required. For personal study only.

✦ Synopsis

A spectrophotometric flow-injection method based on a diazo-coupling reaction is proposed for the simultaneous determination of nitrite and nitrate. Nitrate is reduced to nitrite by using a reductor column which is formed by filling part of the sample loop with copperized cadmium. The flow system produces a signal of which the height of a shoulder in the ascending part of the peak corresponds to the nitrite concentration and the maximum of the peak corresponds to nitrate plus nitrite. The method is suitable for the simultaneous determination of both ions in natural waters. The detection limit is 0.1 mg 1-l for nitrite and 0.5 mg 1-l for nitrate. Up to 22 samples can be analyzed per hour with a relative precision of ca. l-2%.

📜 SIMILAR VOLUMES

Simultaneous flow injection determinatio
Simultaneous flow injection determination of nitrate and nitrite in water by gas-phase chemiluminescence
✍ Toyoaki Aoki; Muneki Wakabayashi 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 396 KB

A reagent-injection flow injection procedure for the determination of nitrate and nitrite in water by reduction to NO followed by a membrane separation process and chemiluminescence detection, with air-stripping, is proposed. Microporous PTFE was used as a membrane to transfer NO to the gas phase af

Simultaneous Determination of Nitrate an
Simultaneous Determination of Nitrate and Nitrite in Biological Samples by Multichannel Flow Injection Analysis
✍ Phillip F. Pratt; Kasem Nithipatikom; William B. Campbell 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 113 KB

cGMP) which promotes vascular smooth muscle relax-An automated method for the simultaneous determiation. ## nation of nitrite and nitrate in biological samples by Many investigators have used L-arginine analogs for using a multichannel flow injection analyzer has been competitive inhibition of NO

Spectrophotometric determination of calc
Spectrophotometric determination of calcium with a flow injection system
✍ G. Nakagawa; H. Wada; C. Wei 📂 Article 📅 1983 🏛 Elsevier Science 🌐 English ⚖ 415 KB

The indirect spectrophotometric determination of 0.8-7.2 ppm calcium in the presence of magnesium, phosphate and sulphate by flow injection analysis (f.i.a.) is described. The method is based on the exchange reaction between the calcium and the zinc complex of ethylene glycol-bis(2aminoethylether)te

Simultaneous Spectrophotometric Determin
Simultaneous Spectrophotometric Determination of Nitrate and Nitrite in Water and Some Vegetable Samples by Column Preconcentration
✍ Gen Feng Wang; Kiyoshi Horita; Masatada Satake 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 135 KB

A direct spectrophotometric method for the simultaneous determination of nitrate and nitrite by column preconcentration has been developed. Nitrate is reduced to nitrite in a copper-coated cadmium column which is then treated with azo dye reagent by column preconcentration, and the absorbance due to

Sequential Spectrophotometric Determinat
Sequential Spectrophotometric Determination of Microgram Amounts of Nitrate and Nitrite in Mixtures
✍ Fang Guozhen; Xie Qing; Fang Mei 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 49 KB

This paper describes three new methods: the first may be used for the determination of nitrite; the second is applicable to determination of nitrate; and the third permits sequential determination of both nitrite and nitrate in mixtures with no prior separation. For the determination of nitrite and