Precipitation Network and Rural Nitrogen Dioxide Network Tender

• Country: United Kingdom
• Summary: Precipitation Network and Rural Nitrogen Dioxide Network Ukeap- No2 Net and Precip-Net
• GBT Ref No: 136034757
• Deadline: 03 Apr 2026
• Financier: Self Financed
• Purchaser Ownership: Government
• Tender Value: Refer Document
• Notice Type: Tender
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• Description:
• Precip Net: Precip-Net sites collect rainwater using standard bulk rainwater collectors on a fortnightly basis to measure the bulk deposition of both acidifying and eutrophying chemical species at 48 sites. This includes calcium, chloride, potassium, magnesium, sodium, phosphate, nitrate, ammonium, sulphate, non-marine sulphate, acidity, conductivity, pH and total rainfall levels. At the two UK EMEP Supersites, daily wet only collectors are operated and samples analysed for the same ions as the bulk samplers with the addition of fluoride. With the long term time series from this network, it is possible to do trend analysis and modelling of chemical deposition via rainfall to UK ecosystems. Precip-Net is measured via bottle collectors mounted on a pole. The samples are collected fortnightly by the Local Site Operators (LSOs), returned, processed and sent for analysis. The bottle collector has a funnel with a polypropylene mesh filter at the base to prevent coarse material entering the collection chamber. Bird deterrents are also located on the top of the funnels to try to minimise contamination from bird droppings. At Auchencorth Moss and Chilbolton (The two EMEP sites) daily wet only collections are also made. This is via a wet only sampler and is used towards meeting the UK-s EMEP commitments. Ion analysis of the daily samples is undertaken, including: Na, NH4-N, K, Mg, Ca, Cl, NO3-N, SO4-S, PO4-P. In the daily samples fluoride (F-) is measured additionally. NO2 Ne...
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 Tender Notice