Hanna Instruments HI 38050 User Manual

HANNA LITERATURE

HI 38050

Hanna publishes a wide range of catalogs and handbooks for an equally wide range of applications. The reference literature currently covers areas such as:

• Water Treatment

• Process

• Swimming Pools

• Agriculture

• Food

• Laboratory

• Thermometry

and many others. New reference material is constantly being added to the library.

For these and other catalogs, handbooks and leaflets contact your dealer or the Hanna Customer Service Center nearest to you. To find the Hanna Office in your vicinity, check our home page at www.hannainst.com.

Nitrate Test Kit for Soil and Irrigation Water

Nitrate Test Handbook

Soil Science and Management

www.hannainst.com

ISTR38050 01/01 PRINTED IN ITALY

Manufacturers since 1978

Index

INTRODUCTION .................................................................................................... 4

THE NITROGEN CYCLE ........................................................................................... 4

15- Separate one side from the other

three to form a cone.

WHY AND WHEN TO TEST FOR NITROGEN.............................................................. 5

HOW TO COLLECT SOIL SAMPLES ............................................................................. 5

FERTILIZATION RECOMMENDATIONS ...................................................................... 6

HOW TO PROGRAM NITROGEN FERTILIZATION........................................................ 7

CONVERSION FACTORS.......................................................................................... 8

WARNING ............................................................................................................ 8

CHEMICAL REACTION............................................................................................. 8

SPECIFICATIONS.................................................................................................... 8

TEST PROCEDURE FOR DETERMINING NITRATE IN IRRIGATION WATER .................... 9

TEST PROCEDURE FOR DETERMINING NITRATE IN SOIL SAMPLES .......................... 10

Calcium Sulfate Extraction ................................................................................ 10

Nitrate Determination ...................................................................................... 11

16- Place the folded filter disc into the funnel and filter the

sample. The extracted sample in the beaker is now ready for analysis.

NITRATE DETERMINATION

17- Use a pipette to fill each glass vial with 5 mL of the extracted

sample and follow the test procedure as for irrigation water (steps

5 mL

2 to 5).

18- Keep it at a distance of 30-40 cm (12-16") from the eyes to match the color.

Rotate the disc while looking at the color test windows and stop when you find the color match.

19- Read the value in the result window and multiply it by 2 to obtain mg/L (ppm)

of nitrate-nitrogen (N-NO of nitrate (NO

). Multiply the reading value by 8.86 to obtain mg/L

Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice.

For best results: Intensely colored samples will make the color matching determination

difficult and they should be adequately treated before performing the test. Suspended matter in large amounts should be removed by prior filtration.

Caution: Ultraviolet radiation may cause fading of colors. When not in use, keep the

disc protected from light, in a cool and dry place.

Interference: Strong oxidizing and reducing substances; ferric ion (positive interfer-

ence); chloride above 100 ppm (negative interference).

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