Iron standard solution, 1000 mg/L Fe in 2% hydrochloric acid standard for ICP

: CPACHEM

Iron standard solution, 1000 mg/L Fe in 2% hydrochloric acid standard for ICP

: CPACHEM

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Buffer solutions, Certipur®, colour coded, Supelco®

: Merck

Nitrate standard solution, 1000 mg/L NO₃<sup>-</sup> in Water (from NaNO₃) Certipur®, Supelco®

: Merck

VWR® AVS TITRINORM Buffer Solutions, 20 °C

: VWR Chemicals

VWR®, Conductivity standards at 25 °C, potassium chloride solutions

: VWR Chemicals

Copper standard solution, 1000 mg/L Cu in dilute nitric acid (from Cu(NO₃)₂) Certipur® standard for ICP, Supelco®

: Merck

Buffer solutions in sachets, Certipur®, Supelco®

: Merck

1,5-Diphenylcarbazide ≥97.0% analytical reagent

: VWR Chemicals

VWR®, Conductivity standard solutions

: VWR Chemicals

Buffer solutions, ready to use, referenced at 20 °C, Certipur®, Supelco®

: Merck

Potassium chloride 3 mol/l (3 N) in aqueous solution, Supelco®

: Merck