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In systemic intervention, boundary critique is important. This means explicitly exploring the inclusion, exclusion and marginalization of both people and issues. Most of the practitioner's attention in boundary critique is usually focused on relationships between stakeholders (i.e. the participants in the intervention and those who might be affected by it). A significant focus is also the remit of the intervention: those things that need to be directly addressed or bracketed out in order to make a difference that is meaningful to a broad range of stakeholders. What is often less visible during boundary critique is the personal and/or professional identity of the practitioner, and the impact this may have on both relationships with others and the construction of people's understanding of the issues they are grappling with. This paper reflects on a project promoting environmental health through Māori community development that reveals the importance of personal and professional identity to systemic intervention. It is argued that it is impossible for practitioners to set aside their identities and become ‘neutral’ modellers or process facilitators. When this appears to happen it is because the practitioner's identity has been (often invisibly) constructed to legitimate his or her activities, and these activities do not transgress the expectations of participants that flow from their understanding of the practitioner's identity and role. Nevertheless, even though practitioner identities inevitably impact on the trajectory of interventions, at least some of their implications can be explicitly acknowledged and managed as part of systemic intervention. Some examples of management strategies are provided. Copyright © 2007 John Wiley & Sons, Ltd.

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The equilibrium reactions of citrate ion with protons and aluminium(III) have been studied by potentiometric titration in aqueous solution, I 0.10 M KCl, 25°C. The protonation constants for citrate, log Ki, corrected for K+-citrate ion pairing, were determined as 5.90�0.02, 4.35�0.01 and 2.91�0.02, i = 1-3 respectively. The model which gave the best fit to experimental data for the aluminium-citrate equilibrium system (TL/TM > 5.3) included AlHL + ( logβ 11.02�0.02), AlL (8.35�0.23), AlL23- (13.40�0.35), Al(HL)L2- (17.36�0.11), AlL2H-14-[ pK (AlL23-)6.07�0.24] and Al(LH-1)25- [ pK (AlL2H-14-) 7.09�0.08]. 13C n.m.r.data established that ligand exchange in the aluminium(III) complexes is slow on the n.m.r . time scale. The spectra were consistent with deprotonation of the coordinated C(2)-OH group commencing between pH 5 and 6, corresponding to formation of the species designated AlL2H-14- and Al(LH-1)25-. The broad structure of the- CH2-, -COOH (central) and -COOH (terminal) resonances for coordinated citrate was indicative of coordination isomers and/or the presence of both mono and bis complexes.