Multistandard incl. NANOCONTROL 100+ standard addition. • Multistandard for the determination of COD, NO3-N, NH4-N, total-N and total-P for checking the NANOCOLOR ® testes 0-04, 0-26, 0-33, 0-64, 0-65, 0-81 and 0-83. • Sufficient for: Standard solution: 12 - 120 determinations; Spike solution: 15 determinations. Checkable parameters and tests and concentrations of the standard solution: • Ammonium: Test 0-04 (Ammonium 10), 3.0 mg/l NH4-N. • COD: Test 0-26 (COD 160), 114 mg/l COD; Test 0-33 (COD 300), 114 mg/l COD. • Nitrate: Test 0-65 (Nitrate 8), 6.00 mg/l NO3-N; Test 0-64 (Nitrate 50), 6.0 mg/l NO3-N. • total-P: Test 0-81 (total-Phosphate 5), 2.50 mg/l P. • total-N: Test 0-83 (total-Nitrogen), TNb 22 12.0 mg/l N.