Avoid a single classification
The INFOCARQUIM nickel sulphate entry records carcinogenic, reproductive and sensitisation hazards. It illustrates why knowing the element is insufficient: the compound, concentration and form must be identified.
Nickel in an alloy, a dissolved salt and products generated when transforming a material are not automatically equivalent. The safety data sheet must be supplemented with information about process emissions.
Connect source and task
Distinguish bath operations, dust-generating work and thermal activities producing fumes. Material receipt and facility cleaning may also create contacts different from those anticipated for the main operation.
A useful assessment identifies who is exposed, by which route and during which tasks. A booth or extraction system in one phase does not demonstrate control of the others.
Address sensitisation
For nickel sulphate, the INSST records skin and respiratory sensitisation. Prevention must consider splashes, contaminated surfaces and hand contact alongside inhalable aerosol.
Compatible symptoms require medical assessment, not self-confirmation of an allergy. Individual assessment of particular susceptibility may lead to adjusted working conditions; clinical data remain confidential.
Select alternatives and controls
In Spain, Royal Decree 374/2001 establishes the general framework and Royal Decree 665/1997 specific measures where the agent falls within its scope. Substitution is considered for the particular compound or process.
Containment, extraction and methods reducing contact should take priority over sole reliance on personal protective equipment. The selected alternative must be assessed to avoid transferring the problem to another substance or task.
Define precisely what is measured
Limits for certain nickel compounds distinguish aerosol fractions. The current reference must be checked in legislation and the INSST occupational exposure limits database, and compatible sampling used.
The report must identify the agent and fraction determined. A result expressed as nickel needs context for interpretation; it does not by itself justify assigning the same hazard to every compound.
Control cleaning, clothing and waste
Procedures must prevent contamination spreading from the workstation to shared tools, rest areas and changing rooms. Gloves are selected according to product and task, checking compatibility and conditions of use.
Follow-up includes control maintenance, training, change assessment and specific health surveillance. Documentation must allow materials and processes used to be reconstructed, particularly when suppliers or formulations change.
Hypothetical example: changing a treatment bath
A workshop changes a treatment bath formulation. Before the change, it identifies the salts used and reviews extraction, skin contact, waste and the measurement strategy.
It does not simply reuse the previous bath assessment. It checks which hazards change and adapts instructions for operators and maintenance personnel.
