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Coffee contaminated by wood preservatives

  • 29/09/2022

We have been advised of an incident where the treatment of container flooring resulted in a consignment of coffee being contaminated.

Prior to loading the coffee into the containers, wood preservative products containing dichlorophenol were used for the treatment of the container's boarded wooden floors. Dichlorophenol, a chemical used to produce the herbicide 2.4D, is toxic and causes severe tainting in most foodstuffs through its pervasive and long-lasting odour. Articles detailing the effects of dichlorophenol are available to Members on the Encyclopaedia on

On delivery, the coffee was found to give off a bad odour. Further analysis of the coffee showed that small amounts of dichlorophenol were present. Due to this contamination all the coffee carried in these containers was condemned for human consumption, and with no other alternative, the coffee was destroyed.

Considering the consequences of carrying foodstuffs in containers previously treated with products containing dichlorophenol, we advise all Members to ensure that they try to obtain data on the history of containers prior to their use. If practicable, separate pools of containers designated for loading chemicals or foodstuffs could be kept, so as to avoid claims such as this in the future.

 Hydrogen sulphide alert

 The Club has been made aware, from several sources, of rising safety concerns in respect of high levels of H2S in some crude oils. Bearing in mind the serious risk of damage or fatality to crew and shore personnel we reproduce below an alert notice issued by the Oil Companies International Marine Forum (OCIMF).

"While the dangers relating to hydrogen sulphide (H2S) are not new there is a growing body of evidence suggesting that H2S levels in some crude oils is on the increase. The reason for this apparent increase is unclear.

H2S is known to be present in crude oil exported from a number of countries including Iran, Qatar, South America, Mexico, Poland, Latvia, Russia and Turkey. Recently higher than normal amounts have been detected in Brent crude and within the last few days very significant amounts of H2S have been found in the ullage spaces of two tankers loading fuel oil cargo at Jubail in the Arabian Gulf.

Terminal operators should remain alert to the dangers posed by the presence of H2S, either within cargoes being delivered or remaining within the residues from a previous cargo. The precautions and procedures described within ISGOTT must be strictly adhered to.

"The advent of inert gas and closed loading systems has largely negated the need to open tanks except for non-routine purposes, although reducing tank pressures to near zero for sampling is a relatively common practice.

"Purging for cargo preparation is also common, thus the planned release of the entire tank atmosphere, particularly where unexpectedly high levels of H2S are involved, poses a significant danger to individuals in the immediate and, in some cases, the not so immediate, area.

Some countries, particularly in Europe, have already stipulated maximum H2S levels in tanks prior to loading and some terminal operators, most recently BP, have reduced their acceptable arrival levels from 10ppm to 5ppm.

"In view of the above, we believe that it is sensible to encourage all crude vessels to monitor tank atmospheres and to advise of H2S levels in order that terminal operators may gauge the magnitude of what is clearly a growing problem. In addition, it may be prudent to encourage the monitoring of fuel oil vessels from areas which historically are known to pose a problem, such as, Jubail. Regarding measurement, please be aware that while Draeger type tubes provide an accurate indication of H2S levels regardless of whether the tank atmosphere is inerted or not, H2S readings taken with an electronic meter in an inerted atmosphere do not.

"Readers are asked to take note of the above and to advise operational staff, surveyors and other relevant personnel accordingly."

The Club has also been advised that in some cases shore installations have been turning away fuel oil stock with H2S. It is believed these stocks could be finding their way into the bunker stream thereby affecting all Members not just tanker operators.

Most people know H2S by its rotten egg smell, however crew should be reminded that it could be fatal to rely on this method of detection as H2S deadens the sense of smell very quickly. A more reliable method of determining concentrations of H2S is by the use of Draeger type tubes or by the use of personal warning monitors.