MACHEREY-NAGEL 91848 Nanocolor Silica Standard Test Instruction Manual

: June 4, 2024
: MACHEREY-NAGEL

Table of Contents

91848 Nano color Silica Standard Test
Documents / Resources

REF 91848
Test 1-48 11.21
Silica (silicic acid)

91848 Nano color Silica Standard Test

Method:
The photometric determination as silico-molybdenum blue

Cuvette rectangular:
Range (mg/L SiO2):
Range (mg/L Si):| 50 mm
0.02–3.00
0.01–1.40| 20 mm
0.1–8.0
0.03–2.50| 10 mm
0.1–10.0
0.05–5.00
---|---|---|---
Wavelength (HW = 5–12 nm):
Reaction time:
Reaction temperature:| 690 nm
15 min (900 s)
20–25 °C
Cuvette rectangular:
Range (mg/L SiO2):
Range (mg/L Si):| 50 mm
0.005–0.200
0.002–0.100
Wavelength (HW = 5–12 nm):
Reaction time:
Reaction temperature:| 800 nm
15 min (900 s)
20–25 °C

Contents of reagent set:
100 mL Silica R1
100 mL Silica R2
100 mL Silica R3

Hazard warning:
Information regarding safety can be found on the box label and in the safety data sheet. You can download the
SDS from www.mn-net.com/SDS.
Interferences:
The following quantities of ions will not interfere: < 10 mg/L Fe, Al; < 30 mg/L PO43–; < 100 mg/L Ca.
Please make certain, that the distilled water which is used for filling up or dilution, is free of silica (REF 918912).
The method can be applied also to the analysis of seawater.
Note:
Please contact MACHEREY-NAGEL for special working instructions concerning a simplified procedure in a beaker (without filling up) and evaluation in 50 mm cuvette.
Procedure:
We recommend using all analytical accessories made from plastic.
Requisite accessories: volumetric flasks 25 mL, piston pipette with tips, silica-free water (REF 918912) Pour into two separate volumetric flasks:

Test sample	Blank value

20 mL test sample (the pH value of the sample must be between pH 6 and 8)
1 mL R1, mix, wait 3 min
1 mL R2, mix, wait 1 min
1 mL R3| 20 mL test sample (the pH value of the sample must be between pH 6 and 8)
–
–
–

For exact measurements in the low range, it is recommendable using a real blank value:

Test sample (< 0.2 mg/L SiO2)	Blank value

20 mL test sample (the pH value of the sample must be between pH 6 and 8)
1 mL R1, mix, wait 3 min
1 mL R2, mix, wait 1 min
1 mL R3| 20 mL silica-free water
1 mL R1, mix, wait 3 min
1 mL R2, mix, wait 1 min
1 mL R3

Fill up sample and blank value to 25 mL mark with silica-free water and mix again. After 15 min pours into cuvettes and measure.

Measurement:
For NANOCOLOR® photometers see manual, test 1-48.
Measurement when samples are colored or turbid:
For all NANOCOLOR® photometers see the manual and use the key for correction value.
Photometers of other manufacturers:
Verify factors for each type of instrument by measuring standard solutions.
The decreasing volume of analytical preparation:
In order to increase the number of determinations, you can work with volumetric flasks of 10 mL: 8 mL test
sample + 0.4 mL R1 + 0.4 mL R2 + 0.4 mL R3, semi-micro cuvette (REF 91950).
Disposal:
Information regarding disposal can be found in the safety data sheet. You can download the SDS from www.mn-net.com/SDS.

MACHEREY-NAGEL GmbH & Co. KG · Valencienner Str. 11 · 52355 Düren · Germany
Tel.: +49 24 21 969-0 · info@mn-net.com · www .mn-net.com
PD 14122 / A011740 / 91848 / 1111.2

Documents / Resources

| MACHEREY-NAGEL 91848 Nanocolor Silica Standard Test [pdf] Instruction Manual
91848, Nanocolor Silica Standard Test, 91848 Nanocolor Silica Standard Test
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