Cytiva products

Water Testing Sample Preparation

Whatman 934-AH RTU - Model 3827-035 - Whatman 934-AH RTU Glass Microfiber Filters for Water Testing

Whatman Grade 934-AH RTU Glass Microfiber Filter Papers are the time-saving version of GE’s 934-AH, which are widely used for total suspended solids analysis. - 934-AH RTU – pre-washed, dried, cooled, and weighed filters with certified mass loss between washing and drying steps of the lesser of less than 0.5 mg or 4% in accordance with US EPA Lab Standard Method 2540 parts C and D. (most filters come weighed to four decimal places, however a version of the 47mm glass microfiber filter can be measured to five decimal places if needed) - RTU for Volatiles – pre-washed, pre-weighed and pre-fired at 550°C aligned to US EPA Laboratory Standard Method 2540 parts C, D, and E - RTU Double Weigh – drying, cooling and weighing steps repeated twice for customers with the highest regulatory concern - Economy versions of 934-AH RTU dissolved, suspended, and volatiles testing filters also available. These filters are pre-washed and dried but not weighed and do not come with barcodes

Whatman GF/C RTU - Model 3822-047 - Whatman GF/C RTU Glass Microfiber Filters for Water Testing

The GF/C RTU line pre-treats our traditional GF/C filter with washing, drying, cooling (in a desiccator), and weighing steps aligned to the requirements of EN 872 – the European norm for suspended solids in water testing. The Cytiva quality organization certifies that these filters have weight loss of less than 0.017 mg/cm2 after preparation, which is required by the standard. Each ready-to-use filter is placed in an individually barcoded aluminum pan that notes the filter weight. The barcode can be used to access a Cytiva certification of the filter weight from our website. Each box contains an additional box ID and barcode that can be used to download the weights of all 100 pans in that box.