Ultrapure water was produced using an Arium pro VF system (Sartorius AG, Germany). Nitric acid (65% w/w, EMSURE® ISO, for analysis), hydrofluoric acid (40%, Suprapur® for trace analysis) and hydrochloric acid used for microwave digestion (30% Suprapur®) were purchased from VWR, Germany. HNO3 was sub-boiled (dst-1000, Savillex, USA). For inductively coupled plasma (ICP)-based measurements, HCl Trace SELECT® Ultra (Sigma Aldrich, Germany) was used.
Suprapur
Manufactured by Avantor
Sourced in Germany
Suprapur is a high-purity reagent designed for trace analysis and sensitive applications in laboratories. It is a premium-grade product that undergoes rigorous quality control and testing to ensure consistent purity and performance.
Automatically generated - may contain errors
Lab products found in correlation
4 protocols using suprapur
1
Ultrapure Water-Based Microwave Digestion
2
Bulk Quantification of Iridium by ICP-MS
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The bulk quantification of Ir was performed by dissolving the entire Fe 2 O 3 + Ir-MC sample in concentrated hydrochloric acid (30 %, Suprapur, VWR) at 100 °C into a beaker. The solution containing the dissolved ions was transferred into a 50 mL volumetric flask and diluted up to 50 mL. The solution was diluted 10 times before assessing the Ir content by ICP-MS (Nexion 350X, PerkinElmer). Beakers and volumetric flask were cleaned with aqua regia before use to eliminate any contaminants. The beakers were additionally boiled one time in 1 vol % nitric acid (HNO 3 ) prepared by diluting appropriate amounts of concentrated HNO 3 (65 %, Suprapur, VWR) in ultrapure water (Milli-Q, Merck Millipore). The Ir quantification was conducted based on a four-point calibration curve (0, 0.5, 1, and 5 μg Ir L À 1 ). 187 Re at a concentration of 10 μg Re L À 1 served as an internal standard to ensure good system performance.
3
Platinum Extraction from Environmental Samples
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Platinum (Pt) was extracted from the wipes (surface sampling) and filters (air
sampling) using 1 ml hot (80 °C) concentrated nitric acid (65%, Suprapur®,
VWR, Fontenay-sous-Bois, France) for 48 h. This process was performed 4 times
successively, to ensure complete Pt extraction. The extraction product was then diluted
with 4 ml ultrapure water (MillliQ®, Millipore, Molsheim, France) before
analysis. Gloves were treated with 140 ml of 1 M nitric acid for 2 h at 80 °C. Urine was
diluted five times with 0.1 M nitric acid.
sampling) using 1 ml hot (80 °C) concentrated nitric acid (65%, Suprapur®,
VWR, Fontenay-sous-Bois, France) for 48 h. This process was performed 4 times
successively, to ensure complete Pt extraction. The extraction product was then diluted
with 4 ml ultrapure water (MillliQ®, Millipore, Molsheim, France) before
analysis. Gloves were treated with 140 ml of 1 M nitric acid for 2 h at 80 °C. Urine was
diluted five times with 0.1 M nitric acid.
4
Sediment Pore Water Sampling Protocol
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Sediments cores were placed under nitrogen atmosphere in a portable glove box. Overlying waters (OW; height of water column = 10-15 cm) were removed using plastic syringes and taking care to avoid sediment resuspension. Aliquots of OW were filtered (1.2 µm syringe filters, Whatman, Puradisc 30, cellulose acetate), collected into acid washed polypropylene ICP tubes and acidified to 1% (v/v) with concentrated HNO 3 (VWR, Suprapur). Prior to use, filters were prewashed with 10 mL of diluted (10% v/v) HCl followed by three rinses with MilliQ water and then kept individually in plastic zip bags. After removing OW, sediment sections from 0.5 to 1 cm thick were transferred to acid washed 100 mL polypropylene centrifuge tubes. Tubes were capped and sealed with Parafilm™ inside the glove box and centrifuged at 4000 rpm for 15 + 15 minutes. Tubes showing visible sediment compaction after the second centrifugation cycle were further centrifuged for an additional 30 minutes.
Tubes were then re-introduced into the glove box and the pore waters filtered and handled in the same way as OW. Centrifuge tubes, syringes and filters were purged with N 2 immediately before core slicing.
Tubes were then re-introduced into the glove box and the pore waters filtered and handled in the same way as OW. Centrifuge tubes, syringes and filters were purged with N 2 immediately before core slicing.
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