BS EN 13656:2020 pdf free.Soil, treated biowaste, sludge and waste一Digestion with a hydrochloric (HCI), nitric (HNO3) and tetrafluoroboric (HBF4) or hydrofluoric (HF) acid mixture for subsequent determination of elements.BS EN 13656 This document specifies three methods for the digestion of soil, treated biowaste, sludge and waste by the use of an acid mixture composed of hydrochloric (HCI), nitric (HNO3) and tetrafluoroboric (HBF4) or hydrochloric (HCI), nitric (HNO3) and hydrofluoric (HF) acid as the digestion solution.Digestion with these acids is effectively considered as a total decomposition of the sample. Elements extractable by this procedure can in many instances be described as “total”, although this will be sample dependent.This document is applicable for the following elements:Aluminium (AI), antimony (Sb), arsenic (As), barium (Ba), berylium (Be), cadmium (Cd), calcium [Ca), chromium [Cr), cobalt ([Co), copper (Cu), iron (Fe), lead (Pb), magnesium (Mg), manganese (Mn), mercury (Hg), molybdenum (Mo], nickel (Ni), phosphorus (P), potassium (K), selenium (Se), silver (Ag), sodium(Na), strontium (Sr), sulfur (S), tellurium (Te), thallium (TI), tin (Sn), titanium (Ti), vanadium (V), and zinc (Zn).This document can also be applied for the digestion of other elements, provided the user has verified the applicability.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 15002, Characterization of waste – Preparation of test portions from the laboratory sample EN 15934, Sludge, treated biowaste, soil and waste – Calculation of dry matter fraction after determination of dry residue or water content EN 16179, Sludge, treated biowaste and soil – Guidance for sample pretreatment.The container in which the sample is delivered and stored can be a source of errors. Its material shall be chosen according to the elements to be determined [e.g. elemental Hg can penetrate polyethylene walls very rapidly in both directions. Glass can contaminate samples with elements that it contains: – e.g. Na, K, Al). Grinding or milling samples includes a risk of contamination of the sample by the environment (air, dust, wear of milling equipment). Due to elevated temperature, losses of volatile elements/compounds are possible.BS EN 13656 pdf downlaod.