Hach DR2400 - Page 83

Aluminum
Aluminum
Aluminum_PP_Other_ECR_Eng_Ody.fm Page 5 of 6
Sample Collection, Storage and Preservation
Collect samples in a clean glass or plastic containers. Preserve samples by
adjusting the pH to 2 or less with concentrated nitric acid (about 1.5 mL per liter)
(Cat. No. 2540-49). Preserved samples can be stored up to six months at room
temperature. Before analysis, adjust the pH to 2.9–4.9 with 12.0 N Potassium
Hydroxide Standard Solution (Cat. No. 230-32) and/or 1 N Potassium
Hydroxide Solution (Cat. No. 23144-26). Correct the test result for volume
additions; see Section 3.1.3 Correcting for Volume Additions on page 29.
Accuracy Check
Standard Solution Method
Prepare a 0.100 mg/L aluminum standard solution as follows:
1. Using Class A glassware, pipet 1.00 mL of Aluminum Standard Solution,
100-mg/L as Al
3+
, into a 1000-mL volumetric flask. Dilute to the mark with
deionized water. Prepare this solution daily. Perform the aluminum
procedure as described above.
Or, add 2.0 mL of solution from an Aluminum Voluette
®
Ampule Standard
Solution (50-mg/L as Al) into a 1000-mL volumetric flask. Dilute to volume
with deionized water. Prepare this solution daily. Perform the aluminum
procedure as described above.
2. To adjust the calibration curve using the reading obtained with the
0.100-mg/L standard solution, touch
Options on the current program menu.
Touch
Standard Adjust.
DR/2400 Reading Fluoride Concentration (mg/L)
(mg/L) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00
0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
0.010 0.010 0.019 0.030 0.040 0.052 0.068 0.081 0.094 0.105 0.117 0.131
0.020 0.020 0.032 0.046 0.061 0.077 0.099 0.117 0.137 0.152 0.173 0.193
0.030 0.030 0.045 0.061 0.077 0.098 0.124 0.146 0.166 0.188 0.214 0.243
0.040 0.040 0.058 0.076 0.093 0.120 0.147 0.174 0.192 0.222
0.050 0.050 0.068 0.087 0.109 0.135 0.165 0.188 0.217
0.060 0.060 0.079 0.100 0.123 0.153 0.183 0.210 0.241
0.070 0.070 0.090 0.113 0.137 0.168 0.201 0.230
0.080 0.080 0.102 0.125 0.152 0.184 0.219
0.090 0.090 0.113 0.138 0.166 0.200 0.237
0.100 0.100 0.124 0.150 0.180 0.215
0.120 0.120 0.146 0.176 0.209 0.246
0.140 0.140 0.169 0.201 0.238
0.160 0.160 0.191 0.226
0.180 0.180 0.213
0.200 0.200 0.235
0.220 0.220
0.240 0.240 True Aluminum Concentration (mg/L) Al