Comments table Loss on Ignition second consultation

MB1 / Cluster / Paragraph/ / Type of com-ment2 / Comment (justification for change) by the MB / Proposed change by the MB / Project Horizontal observations
0 / Lines “waste” and “sediment” in the table / t / LOI is meanwhile validated for waste and sediments (prEN 15169). Validation report will be available in may 2006. / Sediment;validated;EN15169;Alternatively: adjust the temperature after 50 min to 550 ± 25 °C; Waste;validated;EN15169 / To be inserted; Proposal on collaboration with TC 292; Text to be coordinated with equivalent standard for waste. Discussion with relevant WG in TC 292
NL / 1 / ge / ‘Waste’ is included in the scope but no ‘waste’ sample is included in the tests / See above
DIN / 3 / t / Either a definition on water content is missing or equation (2) in clause 11 needs to be changed. / Define water content or correct equation 2 / Changes to be inserted
DIN / 3.3 / t / Is it necessary to define “dry mass” in addition to dry matter? / Skip 3.3 and refer to dry matter / Dry mass not in use, thus could be skipped
NL / 8.1 / Ge / Do not describe separate storage rules for specific matrices. / Refer to a standard for storage conditions. / Upps. Recom.: Refer to standard on sampling/pretreatment(in progress)
NL / 9 / Ge / The reference to the water content is not clear; probably the water content by Karl Fisher or azeatropic distillation is meant. / Clarify / Clarification or reference to relevant standard to be inserted: Upps. Recom.: watercontent is removed from the standard
NL / 9.1 / Note 1 / te / Samples should be kept in the furnace at 550 °C for at least 2 hours. / Change 1 h into 2 h. / Upps. Recom.: The time at 550 degrees C must be fixed at 1.5 h to remove al substances that can be ignited; no repetition of heating till constant mass.is reached.
NL / 9.1 / Note 1 / Te / Muffle furnace is not the most sophisticated instrument. Raising the temperature in 60 min from 250 °C to 550 °C must therefore be done manually in most cases. Is this criterium relevant? No data are presented to support this. / Replace ’60 min’ by ‘slowly’ / Upps. Recom.: accepted.
NL / 9.1 / Ge / Preheating of the furnace to the desired temperature can take more time in case more cool samples are put into the furnace. No comment is made in the text regarding this effect. / Consider a requirement on this issue. / Could be a note, as the text already instructs that the temperature shall be held at 550 for…
NL / 10.1 / te / Standard now makes analysis of one sample per batch in duplicate obligatory. This is not something to be determined in a standard / Remove this. Instead add a procedure of checking the quality of the analysis by analysing a reference sample in each batch of samples. This may be a home made sample or a certified reference material. Results should be controlled with a control chart. / General question to be solved in a general manner for the horizontal standards
NL / 10.1 / Ge / Specifiy only those QC criteria that are specific for this method not i.e. ISO 17025 criteria. / Remove duplicate criteria. / accepted.
DIN / 11 / Equation (2) / t / Either a definition on water content is missing or equation (2) in clause 11 needs to be changed. / Define water content or correct equation 2 / Changes to be inserted
DIN / Annexes / t / In TC 292 any new standard contains an annex “summary of general requirements and recommendations” which contains a table with information especially regarding the circumstances of sampling, storage, sample preparation and bottle material. / Add an annex containing general information. / To be edited according to Guidelines for writing horizontal standards
GB / General / T / The authors appear to have missed the point that the objective of determining LOI is to estimate the non-coal (and non-charcoal) organic matter content.
It is not just a question of whether to use 450 or 550 ºC – the question is what temperature and time combination is best to burn off the organic matter without burning too much carbonized material. Lignite and coal are lost at higher temperatures than the organic matter that we are interested in.
Just measuring the weight loss when a sample is heated to an arbitrary temperature is to this extent meaningless. / Revise Evaluation_DM-LOI-TOC with the objective in mind of estimating non-carbonised organic matter by a simple loss on ignition test. / The objective of the Horizontal/LOI project was from the existing international standard to propose a method that potentially could be horizontal – not to propose a third temperature.
It is a misunderstanding to use LOI as a direct measure of organic carbon.
GB / Title / T / The title (Solid materials – Determination of loss on ignition)suggests a Scope beyond the scope of HOR / Estimation of the organic matter content of sludges, soils and treated biowastes by loss on ignition. / Title changed. The title is changed based on the discussions at the Uppsala meeting.
GB / Table of applicability / T / “sediment” “soil improvers” “growing media” and “waste” are outside the Scope of HOR, which is sludges, soils and treated biowastes. / Revise the table so that it is consistent with the Scope of HOR, i.e. soils, sludges and treated biowastes / Table changed. The table is changed based on the discussion at the Uppsala meeting.
GB / Scope / T / This also stretches outside the Scope of HOR / Revise the Scope so that it is consistent with the Scope of HOR / Scope changed. The scope is changed based on the discussions at the Uppsala meeting.
GB / 6 / T / Charcoal, lignite and coal are potential spurious contributors to weight loss / Add this interference / Interference added to the scope as a note. Changes according to the discussions at the Uppsala meeting
GB / 9.1 / Note 1 / T / Sludges, soils and treated biowastes should not contain paper or demolition timber as such though they might have been in the untreated biowaste. The caution about components that ignite rapidly is however well made, but not for these particular examples because they are outside the Scope of HOR / A possibility for approval for waste remains until further investigated in collaboration with TC 292 – as also stated in the draft standard.