Biomineralisation by earthworms – an investigation into the stability and distribution of amorphous calcium carbonate

Table 3 Granule ACC content (same samples as used for amino acid analysis, Table 4 )

Sample name	Coombe	Frilsham	Hamble	Kettering	Neville	Parkgate	Soil science	St Albans field	Tidmarsh	Willderness
2010
ν₃: ν₄ areas	27.92	28.09	27.92	30.27	32.00	30.77	32.61	25.12	29.79	29.38
% ACC (ν₃: ν₄)	4.0	4.1	4.0	5.5	6.6	5.8	7.0	2.3	5.2	5
ν₂: ν₄ areas	4.07	4.11	4.10	4.42	4.00	4.50	4.91	3.45	4.48	4.06
% ACC (ν₂: ν₄)	−3.2	−2.5	−2.8	2.1	−4.3	3.3	9.5	−12.4	3.1	−3.4
2012
ν₃: ν₄ areas	24.26 ± 0.39	25.82 ± 0.95	23.78 ± 1.14	25.09 ± 2.23	21.07 ± 0.49	27.68 ± 1.73	26.00 ± 1.15	20.33 ± 0.54	23.62 ± 1.40	23.41 ± 2.55
% ACC (ν₃: ν₄)	1.73 ± 0.24	2.70 ± 0.59	1.43 ± 0.71	2.25 ± 1.39	−0.25 ± 0.30	3.85 ± 1.07	2.81 ± 0.72	−0.71 ± 0.33	1.33 ± 0.87	1.20 ± 1.58
ν₂: ν₄ areas	2.68 ± 0.02	2.88 ± 0.06	2.63 ± 0.16	2.32 ± 0.06	2.32 ± 0.06	2.94 ± 0.13	2.85 ± 0.11	2.28 ± 0.02	2.59 ± 0.09	2.59 ± 0.20
% ACC (ν₂: ν₄)	−24.01 ± 0.30	−21.07 ± 0.88	−23.50 ± 2.40	−23.50 ± 2.40	−29.42 ± 0.95	−20.09 ± 1.90	−21.54 ± 1.67	−30.14 ± 0.32	−25.43 ± 1.39	−25.44 ± 3.08

Determined on a subsample of granules, bulked together, taken from the bulked granules obtained in 2008. ACC content was calculated using the calibration curves shown in Figure 1. With respect to the 2012 data, 3 repeat readings were made on the same sample, values are mean ± standard deviation, n = 3.

ISSN: 1467-4866