Performance Evaluation Standards

peCHECK

peCHECK Reference Materials are cost effective performance evaluation standards for routine analysis compliance testing. These standards are available for minerals, nutrients, and solids in water/wastewater matrices and are certified through a comprehensive round-robin study providing independent verification from multiple laboratories.

  • 20 ml vials. No pipetting necessary. Just dilute to volume. Each standard dilutes to 1 L
    - Eliminate a source of potential error, save time with single stop preparation

  • Certificate of Analysis listing consensus values as well as confidence and tolerance intervals
    - Monitor lab performance in a cost effective, simple manner

  • Prepared in large batches
    - Same lot number available time after time allows the possibility of control charting

Download the peCHECK flyer (PDF - Approx. 880 kb)

   
Level 1 Nutrients Catalogue Number: 140-701-101
Parameter
Unit
Consensus Value
Confidence Interval
Ammonia (as N)
mg/L
0.97
0.91-1.03
Nitrate (as N)
mg/L
1.40
1.34-1.45
O-Phosphate (as P)
mg/L
0.74
0.69-0.80
Total Kjeldahl Nitrogen
mg/L
1.04
0.93-1.16
Total Phosphorus
mg/L
0.79
0.74-0.84
Level 1 Solids Catalogue Number: 140-702-101
Parameter
Unit
Consensus Value
Confidence Interval
Suspended Solids
mg/L
238
235-242
Dissolved Solids
mg/L
33.0
18.7-47.3
Total Solids
mg/L
254
242-267
   
   
Level 2 Nutrients Catalogue Number: 140-701-102
Parameter
Unit
Consensus Value
Confidence Interval
Ammonia (as N)
mg/L
8.76
8.40-9.11
Nitrate (as N)
mg/L
13.1
12.6-13.5
O-Phosphate (as P)
mg/L
4.49
4.23-4.75
Total Kjeldahl Nitrogen
mg/L
20.5
18.8-22.2
Total Phosphorus
mg/L
4.82
4.70-4.94
Level 2 Solids Catalogue Number: 140-702-102
Parameter
Unit
Consensus Value
Confidence Interval
Suspended Solids
mg/L
321
310-331
Dissolved Solids
mg/L
10.6
6.38-14.9
Total Solids
mg/L
328
314-342
   
   
Level 3 Nutrients Catalogue Number: 140-701-103
Parameter
Unit
Consensus Value
Confidence Interval
Ammonia (as N)
mg/L
20.5
19.6-21.4
Nitrate (as N)
mg/L
17.7
17.6-17.9
O-Phosphate (as P)
mg/L
11.9
11.2-12.6
Total Kjeldahl Nitrogen
mg/L
28.2
27.5-28.8
Total Phosphorus
mg/L
11.3
11.2-11.5
Level 3 Solids Catalogue Number: 140-702-103
Parameter
Unit
Consensus Value
Confidence Interval
Suspended Solids
mg/L
1928
1895-1961
Dissolved Solids
mg/L
46.0
25.3-66.8
Total Solids
mg/L
1970
1942-1999
   
   
Level 1 Minerals Catalogue Number: 140-704-101
Parameter
Unit
Consensus Value
Confidence Interval
Conductivity
µmhos/cm
476
467-484
Ttl. Hardness (CaCO3)
mg/L
12.3
11.8-12.8
Ttl. Dissolved Solids
mg/L
183
176-191
Calcium (Ca)
mg/L
2.62
2.55-2.69
Potassium (K)
mg/L
15.8
15.5-16.1
Magnesium (Mg)
mg/L
1.31
1.27-1.34
Sodium (Na)
mg/L
31.4
30.5-32.2
Chloride (Cl)
mg/L
20.3
19.8-20.8
Fluoride (F)
mg/L
0.597
0.573-0.620
Sulfate (SO4)
mg/L
8.37
7.75 – 9.00
Level 2 Minerals Catalogue Number: 140-704-102
Parameter
Unit
Consensus Value
Confidence Interval
Conductivity
µmhos/cm
3333
3225-3441
Ttl. Hardness (CaCO3)
mg/L
226
215-236
Ttl. Dissolved Solids
mg/L
1335
1191-1479
Calcium (Ca)
mg/L
63.9
61.8-65.9
Potassium (K)
mg/L
168
162-174
Magnesium (Mg)
mg/L
16.4
15.9-17.0
Sodium (Na)
mg/L
99.6
95.5-103.7
Chloride (Cl)
mg/L
105
102-107
Fluoride (F)
mg/L
3.85
3.33-4.37
Sulfate (SO4)
mg/L
164
155-174
   
Level 3 Minerals Catalogue Number: 140-704-103
Parameter
Unit
Consensus Value
Confidence Interval
Conductivity
µmhos/cm
6022
5758-6285
Ttl. Hardness (CaCO3)
mg/L
515
505-525
Ttl. Dissolved Solids
mg/L
3218
3153-3283
Calcium (Ca)
mg/L
132
129-134
Potassium (K)
mg/L
479
468-491
Magnesium (Mg)
mg/L
45.0
43.1-46.9
Sodium (Na)
mg/L
382
369-395
Chloride (Cl)
mg/L
463
441-485
Fluoride (F)
mg/L
12.1
10.7-13.5
Sulfate (SO4)
mg/L
395
374-417
 
   
peCHECK CRMs
Catalogue Number
Mineral Standard, level 1
140-704-101
Mineral Standard, level 2
140-704-102
Mineral Standard, level 3
140-704-103
Nutrient Standard, level 1
140-701-101
Nutrient Standard, level 2
140-701-102
Nutrient Standard, level 3
140-701-103
Solids Standard, level 1
140-702-101
Solids Standard, level 2
140-702-102
Solids Standard, level 3
140-702-103
 (sorted descending)
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140-704-103Standard, Minerals, L3ea Details
140-704-102Standard, Minerals, L2ea Details
140-704-101Standard, Minerals, L1ea Details
140-702-103Standard, Solids, L3ea Details
140-702-102Standard, Solids, L2ea Details
140-702-101Standard, Solids, L1ea Details
140-701-103Standard, Nutrient, L3ea Details
140-701-102Standard, Nutrient, L2ea Details
140-701-101Standard, Nutrient, L1ea Details
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